A CD spectrometer

As we can see from thees pictures the MEtal Halide has the most complete spectrum.

Interestingly the suns position in the sky changing the spectrum. So when the sun highers or lowers the spectrum changes and the plants react in a different way. Makes you realise that light movers are also something to be dialled into the next grow room.
mrnobody Reviewed by mrnobody on . Drowning in conflicting plant graphs - help! (LED) Still trying to design my LED light through clear understanding and not just mimicking. There is one photosynthetic response curve that shows yellow light has more effect than blue light and that green, while lower, is almost as useful. Other articles say green light may stunt plant growth and that yellow is not much more useful (despite the huge success of HPS). Then there is the photosynthesis action spectrum showing that violet/purple light (400nm) has the highest absorption peak Rating: 5