When i measure light intensity at an angle from a led (60 degrees 50%) it falls faster then cos law predicts (new distance is taken into account) , why is that?
Hi Many thanks for watching, Please share with like minded people. First question, I presume this is in real life where you have taken a light reading. If it is it could be a few possible scenarios: 1. The light meter is being held at an angle this can vary the result significantly. 2. The light in question does not give off light evenly in all directions, therefore the calculation will fail, it is likely that there may be a reflector in the lamp or by the very nature of most LEDs construction light is focussed primarily in one direction and does not radiate out in all direction such as most filament lamps (not sold in the UK anymore) or a candle for that matter. I hope this goes some way to answering your question, I hope you like and subscribe. Please check out my other videos.
@@sparkyhelp3997 I was measuring by phone. And it doesn't have a cosine correction. I figured it out 😀. when a phone is directly above it follows the inverse square law though. Thanks for replying
Thank you for posting : really useful information and clear explanation: subscribed!
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When i measure light intensity at an angle from a led (60 degrees 50%) it falls faster then cos law predicts (new distance is taken into account) , why is that?
Hi Many thanks for watching, Please share with like minded people. First question, I presume this is in real life where you have taken a light reading. If it is it could be a few possible scenarios:
1. The light meter is being held at an angle this can vary the result significantly.
2. The light in question does not give off light evenly in all directions, therefore the calculation will fail, it is likely that there may be a reflector in the lamp or by the very nature of most LEDs construction light is focussed primarily in one direction and does not radiate out in all direction such as most filament lamps (not sold in the UK anymore) or a candle for that matter.
I hope this goes some way to answering your question, I hope you like and subscribe. Please check out my other videos.
@@sparkyhelp3997 I was measuring by phone. And it doesn't have a cosine correction. I figured it out 😀. when a phone is directly above it follows the inverse square law though. Thanks for replying