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Yeah, I'm still looking for another mini-camera solution (both for PC and the Pi) that has the right camera characteristics.

In many cases, yes, but running them at too high a current can be bad!

I think they definitely err on the side of caution.

Yeah, good thing these were very low current applications. Somehow this completely slipped my mind.

See my note above. Had to remeasure it in series.

It's highly dependent on conditions, but you should mainly ensure that the irradiance on the eye is less than 100 watts per square meter per the IEC standard.

Yes, based on some other comments, it seems the NIR meter I used isn't 100 percent accurate. I will probably conduct some other tests with it to see if I can calibrate it or how it compares to other devices. Hopefully it still gives everyone a good relative comparison of the different light sources. Will improve next time!

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With a much lower average longevity :)

​@@jeoresearch eh buddy, I get the sentiment that you're trying to convey here but It's not even correct. You can easily find multiple records of people in ancient Greece living to 70-80, and they didn't have "modern medicine". Of course you were still more likely to die in general (lowering the average), as an infant or due to violence / disease. But the hard pill to swallow is that if you were lucky enough to make it, your life expectancy wouldn't be much different than what we experience today.

Yeah, I'm guessing the meter itself is off. I will probably conduct some other tests with it to see if I can calibrate it or how it compares to other devices. Hopefully it still gives everyone a good relative comparison of the different light sources though.

The meter might be reading off, a lot of meters have a photometric linearity filter that linearizes the response from 980 to 400nm. If you shine a broad band mostly visible light source on on without this filter it will give a false high reading.

This meter has readouts for both visible and IR spectrum, but I wonder if some sort of filter isn't present. I will likely get another device for testing at some point. Any recommendations?

Yeah, someone else noted that as well. I already re-measured with the LEDs in series and put the new values (which were somewhat similar) in the description.

Great question!! Infrared actually shows up as a red or purple hue on most cameras. I believe UV would show up as blue, but that's something interesting to test!

@jeoresearch this is really strange. I have ultraviolet lamp, and my phone camera see's it as light blue colour with violet lens flare. I didn't expected that. Also ir light on camera looks like dark purple.. totally unexpected Sorry for thinking you were liar and for thinking you itentionally put uv light picture

That's great insight, thanks! Hopefully this video will encourage others to test things on their end as well. Are you in aeronautical science by chance?

@jeoresearch general science and engineering.

I hope not for a significant length of time!

@ less than 5 minutes i think

Uh oh, let me check that!

I re-measured, and you are correct. The values when connecting the LEDs in series with the current meter were somewhat similar though: 4mA for the Spinel, and 100mA for the generic webcam. Thanks for catching that!! I've been doing CS for too long, lol.

Great news is likely the diodes are driven current limited; placing a very low resistance path (ammeter) in parallel with a significantly relative higher resistance load (the diode) The majority of current will flow through the ammeter giving a fairly accurate short current readout. Cheaper devices or low current diodes may use a simple resistive load in series with the diode, which would give you a much different readout in a short.

Epic fail!

@@andrewn7365 No it's not. Expecting perfection from everyone are all the time without the learning experience is a fools dream. It's only an epic fail if it's repeated after the lesson.

Sure! Glad I could be of service ~

Lol. That means it's probably pretty accurate!

Actually, since it's VR, I could do one different deficit in each eye!

@jeoresearch That would be awesome and disorienting, most awesome!

Much appreciated 👍

Thank you!!

Look at what they have to do to achieve a fraction of our pow... poor sight

I think the difference is mostly interference effects, which are impossible to simulate with just three color channels (and would be computationally *expensive* to simulate properly).

I’d imagine that’s what the game does, but we can’t see the offset because we aren’t in vr

@@JonBrase wdym, our eyes themselves only have 3 color channels and that doesn’t change with nearsightedness

@@frescula Because many of the things that make actual nearsightedness look different than what's shown here depend on the fact that light is made up of waves that can add up or cancel out. When you have blur, light arriving at the same point on the retina no longer all comes (on its last bounce) from the same point in the scene, and when you have waves that originated from the same light source, reflected off different parts of the scene, and arrived at the same point on the retina due to blur, the difference in total path length from the original light source affects how the waves add up or cancel out. And if objects in the scene that get blurred into each other reflect different wavelengths differently, the mix of wavelengths arriving at a given point along different paths also affects how the waves arriving along that path add up or cancel out. This creates image artifacts like alternating light and dark lines in the blur around the edges of an object, and to duplicate that you have to track different wavelengths in higher detail than just RGB, calculate the interference effects, and only convert from full wavelength detail to RGB after taking interference effects into account, because the interference effects depend on things that happen before the biology of the human eye bins everything into 3 color channels. In the end, to simulate this stuff, you need to: 1) Do raytracing, which is already computationally expensive. 2) Instead of each ray just having three channels for RGB, each ray probably needs to have tens of color channels, and then each color channel probably needs at least 4 polarization channels (and I may be lowballing that significantly), and then each polarization channel needs at least 8 phase channels (once again, quite possibly way too low), and you need to calculate the phase that develops for each wavelength along each ray and adjust the phase channels at each bounce accordingly, and then every texture needs to specify reflectivities for every wavelength as well as how, and if, it affects polarization for light arriving from different directions. You have hundreds, if not thousands, of channels and you need to calculate the effect of every bounce on each one and then figure out how it all reduces to RGB at the end.

We could actually simulate chromatic aberration and other optical irregularities, but that would require significant shader work.

You would think!! Unfortunately, it has a lot to do with the optical characteristics of the display itself, i.e. what type of lenses are used to view the VR display up-close.

@@jeoresearch As in this only runs on the Apple headset or something? I subscribed because of your response, although I feel my question might have been misunderstood. Could you run this program, in the background, so I don't have to wear my glasses in my headset? Also, are you either an ophthalmologist or an optometrist?

​@@BollWeevil To my knowledge, correcting vision can't be done at the software level. Vision correction needs to happen by placing a different lens between your eye and the world (or the VR display screen), so you'd actually have to replace the lenses of the headset to correct for any visual deficits. I'm a professor of computer science that works on a number of display, eye tracking, and optics problems. Visual deficits is one of my research areas. And thanks for subscribing!

HTC Vive Pro

Lololol

Yeah, sometimes it's hard to visualize if you haven't seen it first-hand. It's like trying to describe the color orange before you've ever seen the color orange.

@@faceless.cowboy9966 being both near and far sighted is a pain a times, but I can never grasp far sightedness

Ouch... What is your prescription? I.e. how many diopters?

I got astigmatism in one eye and short sighted in the other, i got a 2 in perception

If you’re not farsighted or nearsighted then that’s how it’s supposed to be

You're pretty lucky!

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