Instructables

Lighting with RGB LEDs

Hi all. I am wanting to get into using led lighting for long exposure photos (for the purpose of thermal imaging) and I am looking at RGB LEDs for providing the colour. My question being, should I try finding LEDs that have similar light output in mcd or stick with RGB LEDs? The reason I am asking is when I am looking at specs, the green seems to be 2 to 4 times as bright. Is this an issue? 

Also, the RGB LEDs seem to have a much wider viewing/ lighting angle. 

I am not sure where to go from here. Any help would be appreciated. 

Thank you all very much for the time. 

Professorred

lemonie1 year ago
If you want to capture "thermal", i.e. infra-red then you should use long-exposure on a digital-camera (silicon picks up IR better than film).
If you just want light then it doesn't matter much, unless you want lighting that isn't visible to human eyes?

L
professorred (author)  lemonie1 year ago
Thank you. I am wanting visible light. I was wondering because it sounds to me like when there is a mixture involving the green, there will be too much green. I was wondering if this would be correct (and I should try to match the mcd output) or it there is something to do with optics that negates this (meaning that I should not if I want the green to be equal).
You can get "white" LEDs, they look white. But if you're capturing with an electronic camera they may look different.
I don't know any better.

L
professorred (author)  lemonie1 year ago
I am trying to get different colors to show different temperatures. I am just trying to figure out if the RGB LEDs will have too much green. I guess I can always try it and see if it will work.
You should probably use a tungsten-halogen bulb if the temperature range matters. But I don't quite understand why the illuminating-temperature matters.

L
professorred (author)  lemonie1 year ago
I was inspired by http://www.instructables.com/id/Build-a-Thermal-Flashlight-Light-Painting-with-T/ and wanted to make it.