What makes green lasers the BEST lasers?
ฝัง
- เผยแพร่เมื่อ 29 ก.ย. 2020
- Green lasers have both advantages and disadvantages. For safety reasons I have so far focused on telling about the possible infrared leakage from some types of green lasers. To a point where it seems like I wouldn't recommend green lasers at all...
But I do! They have a big advantage that makes them awesome and maybe even safer to use than other lasers: lumens. I explain how in this video.
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#GreenLaser #Lumens #GoGreen - วิทยาศาสตร์และเทคโนโลยี
Just casually saying "It's over 9000"
I love it.
The slight pause cemented it in
Wasn't expecting "It's over 9000" in here...
Green lasers are great - glad we are on the same wavelength.
522 nm! 😎
=;o)
That joke made me turn red.
Pin this man
Because it gives you willpower...
Of a Green Lantern!
It's over 9000!
I regret nothing.
I was too late to do it myself XD
Parody video: "Brainiac75 & the Venom Cube are OVER 9000!" th-cam.com/video/IzE4pGEq59A/w-d-xo.html
@@yin-fire3263 yep me too
The infrared light is simply due to a pile-up effect in the detector, so there is no infrared light coming from the laser. It occurres when two photons are counted within a single detector frame. It is particularly noticeable at higher intensities of light.
Thanks for the input. I think you are right. Another commenter mentioned that the 2nd order diffraction of the 522 nm will overlap the 1st order diffraction of 1044 nm. The spectrometer reads it as 1st order infrared...
I even mention something similar in my previous but didn't think of it. Still needs a little further investigation since I do not remember seeing any false reading of 2nd order when testing the 1.5W 446 nm Arctic. Would think this would be bright enough to do the same. But maybe I was not pointing the spectrometer's sensor directly at the Arctic's dot. At a lower brightness reading, the 2nd order will be too weak to be picked up by the spectrometer.
@@brainiac75 That's correct; internal diffraction grating within spectrometer is producing 2nd order diffraction of the input beam, thus the internally 2nd order diffracted beam falls in the same position on the CCD as would a 1st order 1044. It's not necessarily brightness that does it as you're coupling through a fibre, it's more likely due to how the intense light actually illuminates the internal grating; presumeably there is a slit within the diffractometer which should help with that.
@@AlexA-hm6kj big brain
@@brainiac75 It most likely have to do with the cross section area of the beam as well - since the light intensity hitting the sensor, is not just dependent on output power. Some pointers have wider beam than others and thus have a less concentrated beam (but the good thing is that such a beam has less divergence and can also be focused enough to burn stuff, further away with the same output power, haha).
You could try to focus both lasers to a small dot before measuring them - and see if the problem increases. It should do, if it's intensity related. Just be careful to not damage the sensor (since light intensity will be extremely high in that focused dot)
I was going to say it was a reflection of the initial light wave. Similar in its creation as a guitar string is used for sound, all of the 1/2s are included, just not always noticed.
I think I've said it before, but the safety notice in the beginning of each video is such a great addition.
Too many youtubers just carelessly do dangerous """Experiments""" without any warning to their, often, young audience.
Props!
Glad you like it! I would hate to be the guy that gets someone unknowingly hurt from a video. And why not put my channel's logo into good use ;)
@@brainiac75 ⚠ *Brightnes per watt does not make a laser more safe!*
The human retina itself is red and hence gets damaged much more easily by non-red lasers because of the produces heat. Point a red and other colour lasers at a red balloon and test how much power it takes for the balloon to pop. Only a laser that can not pop balloons (not even black ones) can be considered safe for household use (including foreseeable misuse as child/cat toy). Please add this to your safety guidelines.
That's why all those cat igniters (cheap illegal laser pointers) in fancy colours are so problematic. The horrible invisible IR of cheap green pointers that makes people stare into them at cold (where the visible light disappears) is only one part of the problem. That blue lasers nowadays are sold overstrong to visually look as bright as green ones is definitely irresponsible.
(Do you smell all those cats set ablaze...)
Please analyze now those Chinese tiny starfield projectors (size of a laser pointer but with USB cable) sold for 5$ at eBay. They have a grate with static starfield beam and exist in green (likely with IR) or purple colour with optional screw-on lenses to change the pattern. They are even described as "lamps", not lasers - possibly to avoid regulations. I suspect both to be fairly dangerous to use.
Braniac: what does the lux meter say?
Lux meter: IT'S OVER 9000!!!!
_Brainiac75: "I'm too sexy for Vest, too sexy for my vest, so sexy my eyes hurrrrrrrt"_
xD
Haha, I'm actually almost as bald as Richard Fairbrass. Now that song is stuck in my head for the rest of the day... thanks.... x)
Thanks for shedding some highly concentrated light on this issue
I see what you did
i love to work on lights, & laser is the most amazing science art of light, it can burn, engrave, melt, cut, & it obtains energy, i always wonder what will be possibilities of making the sun as a laser diode.
*🎵the sun is a deadly lazer🎵*
IT'S OVER 9000
it over 9000
vegeta your scouter must be malfunctioning
Thanks to the equations I could calculate the Lumens and Lux from the 180W green laser I use at work, comes out 108543 Lumens and 245 Giga Lux :) or about 2.23 million times the lux level of the sun at noon on a clear day. Think I will keep my safety glasses on
The IR signal is likely an 'artefact' from the spectrometer. If I detect a signal at 1000nm, all I know is that there is light at either (1000nm, 500nm, 333,nm, 250nm, etc...).
Measure the spectrum with and without the IR filter. If the 1044nm peak persists, it's 522nm diffracted to 2nd order.
I've worked with many 532nm DPSS lasers of high quality ($10k+) and they all operate on the same principle. An 808nm laser diode pumps an ND:YAG crystal. This generates the 1064nm beam, which is frequency doubled with a crystal to emit 532nm. Typically, 532.3nm. Your laser appears to be of a different construction.
I was about to suggest the same about the peak being a second order diffraction coming from the spectrometer itself.
Hm, you may be right. I'm still new to using a spectrometer. I just don't remember seeing a peak around 892 nm when I measured the 1.5W Arctic 446 nm blue laser in an earlier video. Wouldn't that happen if the spectrometer has a 2nd order overlap from very bright sources? But a 2nd order overlap sure makes more sense than half-harmonic generation somewhere in the setup.
The shown laser uses a direct-diode laser (diode: Nichia NUGM03) - not a DPSS type. Thanks for watching and maybe explaining the odd peak. Needs further testing :)
Hm, you may be right. I'm still new to using a spectrometer. I just don't remember seeing a peak around 892 nm when I measured the 1.5W Arctic 446 nm blue laser in an earlier video. Wouldn't that happen if the spectrometer has a 2nd order overlap from very bright sources? But a 2nd order overlap sure makes more sense than half-harmonic generation somewhere in the setup.
The shown laser uses a direct-diode laser (diode: Nichia NUGM03) - not a DPSS type. Thanks for watching and maybe explaining the odd peak. Needs further testing :)
@@brainiac75
A 446nm laser will absolutely show a 2nd peak at 892nm on a spectrometer. The diffraction efficiency into 2nd order is much much lower than 1st order, which is why the peak is so much lower. But if you measure again and crop out the spectrum to only see 880-900nm, you'll find the 2nd order diffraction of the 446nm peak.
@@brainiac75
If you have fluorescent tubes somewhere, measure that spectrum. You should see a mercury emission peak at 365.0nm as well as 435.8nm. See if you can find the 2nd order lines, 730nm and 871.6nm. Notice how much weaker they are.
i love your accent, its so soothing and dreamy.
Wow, so lumens, lux and cd/m2 are all a measure of how bright something appears to the human eye, and not an absolute measure of luminous (electromagnetic when outside the visible spectrum) energy?! I admit I didn't realise that at all. Well, that's why I subscribe to channels such as yours - one learns something everyday. :)
I also didn't realise this. It almost seems unscientific... 🧐
@@iamdave84 Exactly!
Wow it’s been a little bit since I’ve watched. Glad to see that you are still doing the stuff we love.
Something that I have been wondering about is how safe are green laser levels are, I would like to know how powerful they are and if there is any IR leakage.
Love your content! Keep up the good work!
3:31 IT'S OVER 9000
You do look like the kind of guy who would model for high-visibility vests.
I do look and feel better in a high-visibility vest xD Thanks for watching!
I was laughing so hard when you said
“ it was over 9000!!!”
your videos are always great!
Informative and cool video as always, loved the nod to the over 9k meme, it was pleasant surprise. 😂
Stay safe and have a great day!
Thanks, the meme is getting old but seemed fitting here ;)
Common 532nm(±10nm)laser pointers are DPSS laser pumps from 808nm infrared laser(808→1064 and then frequency doubled to 532, the original 808nm is usually from laser diode, but theorically can by any laser source), thus there are always be some original 808nm leaked.
But if this stuff uses native green laser diode(520~525nm), no infrared would be possible to leak.
Very educational, great job as always!
2:25 I thought it was the norwegian flag at first😢🇧🇻
Very similar. Just misses the inner indigo blue cross :) Thanks for watching!
I am late to the beautiful Brainiac75 party but thank you. Thanks to the supporters too.
Nice job! Thanks.
Made my day!
I have no idea about the second IR peak, but I would try a different surface to target it at. It may be not all reflected light is returning as the same wavelength.
No idea if you already know, but when an atom absorbs a photon, the electron jumps to a higher orbit and then falls back down releasing a new photon with the same energy.
If the photon energy is high enough it will jump up several levels, the electron can then make two (or more) smaller jumps back to its ground state, reflecting longer wavelength photons.
Green probably isn't a high enough energy photon, but I suppose it ultimately depends on what the target surface is made out of.
Thanks for the input! Fluorescence can not be ruled out, but I've received a tip, that it may be a 'false' reading. It may be the 2nd order of diffraction of the 522 nm light. Makes perfect sense the more I think about it. Needs further testing though since I didn't spot any 2nd order from the very bright 446 nm 1.5W Arctic laser in a previous video.
i love this channel
Over 9000 *and* there's no way that can be right. You almost could sneak the entire quote in there!
Its odd that growing up, I always loved neon Green the most. Maybe I recognized its vibrance.
What!? 9,000? There's no way that can be right.
The two watt white at the end of the video 10:25 started looking more violet as you dimmed the exposure.
Could you do a video regarding the properties of a crystal ball and how it bends reflects and refracts light. Thank you.
Maybe. Optics can be very interesting. I have some clips in an old video of mine with a crystal ball: The Beauty of The Sphere. Thanks for watching!
I couldn't belive when i heard ''it's over 9000'' (with such calm voice too)
6:58 Wait, so the VenumCube's laser isn't a DPSS laser? What kind of laser is it?
Amazing 🤩
Thanks - glad you like it!
Braniac! What does the luxmeter say about the laser's power level?
I enjoy your laser videos.
The bluray 500mw laser at 10:20, where did you get that?
Glad you like it. The 500 mW bluray laser is a generic laser sold on eBay. Search for something like '405nm 500mW laser module' and get one that comes with the control board and AC adapter (close up and power test of it in this video: th-cam.com/video/c4RsQdyjgJE/w-d-xo.html ). I bought it from a seller called xspar but I think they are all the same...
It’s videos like these feed my obse... INTEREST in the color green
You are an awesome youtuber you should be making more money!
Thanks! I am far from being able to make a living from my videos, but don't worry. I have a dayjob too :)
I like the use of #GoGreen :)
Hehe, there are different ways of going green ;) Thanks for watching!
RGB is just better because of the color variety.
Though the Venumcube would be a cool oscilloscope
Depending on the inner construction of your spectrometer, the IR peaks could be the higher order reflections of green off e.g. a grating used by the instrument to measure wavelength.
Yep, this seems to be the explanation based on the feedback in the comments. Makes sense, since 2nd order 522 nm diffraction will overlap 1st order 1044 nm diffraction. Completely overlooked this, even though I mentioned something similar in the previous video x) Ah well, I'm new to using spectrometers. I will get better at the art based on your feedback - thanks!
@@brainiac75 Glad that you've figured it out! We've got several different optical spectrum analyzers in our lab, and all of them seem to do that, even the huge high-resolution HP/Agilent beasts. This is just inherent to their construction. I guess if you intend to measure emission from a system where you suspect harmonics, you need to do it separately for each region, using appropriate filters to block the other part of the spectrum (just like you do with safety glasses and IR card in your videos).
Vegeta, what does the scouter say about his Lux level?
What protection glasses do you recommend for a 450nm blue laser? (10W)
Video uploaded a minute ago and people here are commenting how cool and exciting the video is which is almost 12 mins big
I guess they know from the intro where this video is going ;) Thanks for a fast watch after upload!
Over 9000!
Years ago, in high school, I always wondered why green light was so crisp (red light was also easy to see) while blue light was so damn blurry. A physicist friend of mine later in college ended up actually looking into it.
Turns out there was some science behind that, and not that my eyes were defective (which I assumed was the case) :)
Blue is the most dazzling colour because it is scattered most (beam bounces around) inside the eyeball. That's why bluish LED car and bicycle headlights are much more dangerous tonight than traditional halogen.
what is the camera used at 10:37
thank you for your videos, i was wondering in the past what color was the most visible for night fishing. as i wished to paint some fishing float and equipment not to lose them. you answered many questions!
That's shot on my newest main camera, a Sony FDR-AX700. It has three build-in ND filters. Very useful for filming lasers :)
Glad you like my videos. The shown luminosity function is for our photopic vision. That's our color vision under well-lit conditions. Our night vision under very low light - where we can't see colors - is called scotopic vision. Our scotopic vision is most sensitive to a bluish-green 507 nm light. Not a big difference but worth considering ;)
@@brainiac75 thank you very much for the information! i noticed in Christmas time that blue lights are the brightest looking and even some i can see 3-4km away across the lake where i live.
It is likely your reading equipment is reading an overtone that doesn't exist. Our ears do the same with sound. Two tubas playing the same note very cleanly will clearly create multiple overtones in what is heard. Those higher notes are not actually being played, however our eardrums still perceive extra octaves. Same process as electrical vibration.
FØRST :D Takk for video
nope you're about 10th place
@@OctoBirb8Claws 😓
Første dansker? Tak for altid at være tidlig ude, Anders :D
Jeg tror Anders er fra Norge. 😉
6:38 maybe the heat of the material emit the Infrared, because y'know lazer heat stuff and stuff emit infrared when gets hot, idk im not a scientist just a wild guess xD
I suspect the material you had the Lasor shooting at was getting excited and emitting infrared?
That could happen if the laser heated it to almost glowing hot. But I expect it would be a broader band in the infrared - not a tight peak. I think another commenter solved the mystery: 2nd order diffraction of 522 nm light is in the same place as 1st order diffraction of 1044 nm. So the spectrometer thinks it sees infrared, while it's just an extra, internal diffraction of the very bright green light. No infrared there. Thanks for watching!
Nappa: Vegeta what dose the Lux Metter say about the green lasers light level!?
Vageta: Its over 9000!
Nappa: What, 9000, thats impossible!
First! Good video
you are the actual first one
Thanks! Very fast response after upload :D
@@brainiac75 I love your videos man! I have a youtube channel, the codex workshop, it's very new but I have a cool video on using high voltage for a project.
*OVER 9000*
Thats so interesting ! Is there a similar value for which frequency our ears are most sensitive to ?
Actually there is. If you search “Equal-loudness contour” in Wikipedia, you will see a set of curves that all have a minimum around 3 to 4 kHz, which means our ears are the most sensitive around those frequencies. The actual frequency depends on the intensity of the sound and other factors like age or just differences between persons.
My guess as to why it are those frequencies, is because they are important to understand speech. I only hear up to about 2kHz with one ear, and understanding people with only that ear is extremely difficult.
Good question. Green light is the most common light in the typical human habitat, there's probably a sound frequency that's more common than others
Smoke alarms beep at the most sensitive frequencies. That's why they torment so much despite the small battery. Ar bass range you would need 100W to feel as loud.
Have they by any chance gotten close to making hologram objects with specific laser designs??
could you set the rgb laser to only green and compare them? Would it be brighter than the only green?
7:34 first of all,"It's over 9,000"... Very beautiful very beautifully done. Second I have a question; I understand that our eyes are more sensitive to green light. I work with and sell pipe lasers that are green for this very reason. But that's our eyes... The lux meter... Why is it showing a drastic increase in brightness? That I don't understand. I mean I don't really know how a lux meter works exactly. I know what it's for, But is it supposed to like mimic the human eye or something?
Holy s**t ! I’ve guessed the right lumens ! I guessed around 500 lm and it’s right even though i didn’t calculate it :-3
I guess 175-190 Lumens but that could be well below my doubtful back guess in my mind over 315 Lumens
KSP music... It fits btw
what is the function of the springs behind the lens of a blue laser?
Red colour is my favourite still
I got tired of red back in the early days where a weak, red laser was all I had for years... But today I do enjoy a powerful red laser beam. Thanks for watching!
@@brainiac75 I made my first red one in 1990th from a scrapped CD player. I even tried hard to add a current regulation circuit from a magazine to protect the diode (likely a resistor would not be worse), but the thing was so dim that it was barely visible (and grew dimmer when heated up), But it was stil exiting to see the grainy red light and how it formed stripe patterns when shining through fine cloth and such simple things.
Fun fact:You can see TV remote controls flash of Infrared radiation using your devices camera try it out (because your devices camera can see a bit more than the visible spectrum)
Also because TV remote controls use Infrared radiation so that's how TV's know what button your pressing. Try it and you'll believe me.
If I have a wrong grammar don't blame me English is not our primary language but secondary.
It always seems to be green lasers that idiots shine at aircraft.
I guess those must be the more advanced kind of idiots then, who are just smart enough to figure out that green lasers are the brightest, but still too dumb to understand the consequences of their actions…
green will dazzle, IR will blind
wow, its power level is over 9,000, neat
i wonder if you fiddled with the position of the sensor and reflective surface to get it to line up the reading of over 9000
So when you cooled the green laser it stoped being visible, but what happens if it is heated up instead?
3:32 wasn’t expecting a meme there..
No camera sensor was damaged in the making of this video?
Nope. Luckily the beam is moving very fast when the show laser is projecting an image on a nonspecular wall - making the reflected light eye- and camera safe (though I may be pushing it with such a small projection at a short distance). Notice how I avoid filming the steady dot when making the power measurement. The camera would not be happy about a 6 seconds steady spot from a 1 watt laser... Thanks for watching!
Mike is a powerful red laser I wanted to old school 🏫
To measure lumens you need to setup an optical integrating sphere...
about lasers..... It may be (it IS by the way) dangerous but what could happen when, in a safe location, you combine all of your lasers with an optic? or into a single point? what if this beam meets a magnet?
Im guessing the UV light comes from the daylight hitting the wall and reflecting into the sensor
Thanks for the input. Needs further investigation - I'm new to using spectrometers. But another commenter may have solved it: It could very well be 2nd order 522 nm diffraction. That is in the same place as 1st order 1044 nm diffraction. Usually, 2nd order diffraction is not visible on the spectrometer, but this laser is so bright that 2nd order of the green could be detected by the sensor. Thanks for watching!
@@brainiac75 damn thats so interesting! awesome! Keep up the high-quality content ;)
I just wish that other lasers could be anywhere near as good, id love an efficient purple-blue laser
I wonder where the 2 watt krypton lies. Or was it only 1W? I forget.
what would happen if you would use a monster magnet on molten iron?
OVER 9000!!!! 😁 😎
I noticed how much brighter the green laser was when I got red, green, and blue lasers of the same wattage.
3:30 its over 9000!!!!
I think all headlights should be green, blue is the longest wavelength of visible light and yellow light is the least blocked by particals (that's why fog lights are yellow) so u blend them together and that's why green light travels further than blue light in real world environments. I also think blue headlights should be banned, even though they look nice blue light is the worst for are eye's because of the long wavelength. Side thought It's funny we use red for stop and green for go because of are feelings of what the colors represent but for visibility and safety logic it should be the opposite and I still don't understand why the passing lane on a multiple lane freeways don't have a higher speed limit than the slower or exit lane it should have It's own speed limit 10mph faster that would make roadways work smoother.
Can a lasercube run on dmx?
I removed the harmonic crystal that converts infrared to green in my green laser pointer and now it's only emitting 1064 nanometers.
One thing i dont understand, yes our eyes perceive green light to be way more brighter then blue light, but a lux meter ? wouldn't it measure the same ?. For example two 200mW lasers (532nm and 650nm ) tested both have the same power, to our eyes the green one will be much more brighter than the red one, but to a luxmeter wouldnt it be the same " brightness" ?.
Could it be possible that the laser is heating up the surface it's hitting, and causing the surface to release infrared light due to heat? I have no idea why it would be exactly double the wavelength, but it's not too much of a stretch to suppose that it'd be related.
Thanks for the input. I would expect heating to be a more broad band in the infrared. Could be interesting to test it with a laser burning some wood etc.
Another commenter may have found the solution: 2nd order diffraction of 522 nm light is in the same place as 1st order diffraction of 1044 nm light. With a very bright light source, the spectrometer may pick up the 2nd order diffraction - a false reading in infrared.
The IR you are detecting is from ambient light
Thanks for the input. I would expect ambient infrared to be a wider band - not a peak, but it needs further testing. Someone suggested it may be 2nd order diffraction of the 522 nm light inside the spectrometer. 2nd order 522 nm is in the same place as 1st order 1044 nm infrared, so seems very plausible. No infrared - just a 'false' reading on the very, very bright 522 nm light.
Is there coorelence with wavelenght and eye damage? 1-5mw is the safe maximum... for any wavelenght?
The more powerful in milliwatts, the more damaging. Regardless of wavelength. That's why lux and lumens tells you next to nothing about how safe a laser is to use. But the output in mW does. Thanks for watching!
Nope. The human retina itself is red and hence gets damaged much more easily by non-red lasers because of the produced heat. Point a red and other colour lasers at a red balloon and test how much power it takes for the balloon to pop. Only a laser that can not pop balloons (not even black ones) can be considered safe for household use (including foreseeable misuse as child/cat toy). Please add this to your safety guidelines.
⚠ *Brightnes per watt does not make a laser more safe!*
@@AerialTheShamen hmm interesting, tell me more... i am asking for reasons
I want to build bunch of lasers (i need help with laser hosts..)
And i want all of them to be 5mw or whatever eye safe is, i essentially want multicolored toys...
Probably i'll just go with arround 5mw and call it a day
There was an eye damage warning campaign on tv news when green laser pointers became popular, with an eye doctor demonstrating the red balloon experiment.
This New York Times article mentions that green is absorbed stronger by the retina and so produces more heat:
www.nytimes.com/2011/03/01/health/01laser.html
Here is a brief note that wavelength matters with retina damage:
www.sciencedaily.com/releases/2018/01/180126130442.htm
It could be possible that the infrared that you are detecting is background and is not coming from the laser itself
I used to do this really REALLY stupid thing as a kid, I took a red laser pointer, and just looked directly in to it while it was on, because it looked like pretty, now my eyesight has definitely degraded but somehow not to the point I need glasses.
I remember when I was a teenager and got my first red key chain laser. They were rare back then, so I showed it to a kid in my family. He desperately wanted to try it, so I gave it to him repeating out loud: Don't point it into anyone's eye!
The first thing he did was to point it into his own eye... Luckily the laser was only ~1 mW and the blink reflex kicked in saving his eyes from any damage. But it shows you were not the only one and laser's are not kids toys :) Thanks for watching with your remaining eye ;)
Shouldnt such test be in a room with no external light to mix in?
That would be optimal, but no backlight in the luxmeter's screen, so I need to have some light on it to film it :) Thanks for watching!
Why does the green venomcube appear as though the animation has glitches?
The interesting question is “why is green ‘brighter’ than other visible colours?” Difficult to explain!
makes sense for the eye to be evolved to be most sensitive at the wavelength the sun emits in largest quantity
Tommaso Valerio & soci Water Rockets true. Like our hearing is better at midrange. I think light is more than that! He was not measuring relative to our vision he has measuring relative to other wave lengths, no?
Green/yellow is the easiest for us to see, since there are three types of cones ('color sensors') in our eyes: S, M and L. They overlap in the middle of the range, making that range more visible to us. Green just happens to be there.
en.wikipedia.org/wiki/Color_vision#Physiology_of_color_perception
The luxmeter is calibrated/programmed to have the same response as our eyes. That's the special thing about lux and lumens. They are units not only based on physical properties like measuring watts - they are based on how our eyes work.
Thanks for watching!
Brainiac75 I see now. Simple. I didn’t know that info about Lux and Lumen. Thanks
3:32 ITS OVER 9000!!
Neat
Im from denmark
But the lux meter doesn't work like human eyes ...
Soooo ... i think it actually is brighter
The luxmeter is programmed to match the human eye response. Though I do think it should be adjusted by +10% when measuring green only. So yeah, the green may be even brighter. However, it has the advantage of drawing the whole picture in green, where the RGBs only use the red laser for the perimeter. Not the most scientific test as I admit in the video ;) Thanks for watching!
@@brainiac75 thank you for answering me (: