That is friggn brilliant when you think about it. I like how you roll. :DView attachment 677404
You mean this guy?
View attachment 677413
It's called a radiometer and we do know how it works. :)
I used one to test my arrays.
Because meters measure white light, and I needed to find out how close I could hang my lights.
I note the speed in sunlight, then adjust the LED's distance until it's about the same speed.
Kept me from getting light bleach.
Then I adjust the R:B ratio until the leaves look black.
That get me maximum absorption.
Yeah, I know, it's not "science" but it works. :)
I did futz with lasers a bit, just because I could.
Managed to raster scan a whole leaf, but it was not easy.
No matter how you slice it, 5 mW. won't grow a bush. :D