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Has anyone tried using Color Transference filters(CT gels) as used to shift color temp(degrees Kelvin) as needed?
We use them in the film biz to make a 3200 Kelvin light 5500 Kelvin. Just thought it might be a cheap way to make the veg cycle more blue if you have straight HPS lighting.
I mean a sheet of quarter blue CT is like $5. As opposed to an adaptable bulb or entire additional $ystem.
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The problem with that is that filters don't really shift the spectrum, they block (absorb or reflect) light in certain wavebands, while allowing light at other wavelengths to pass. This changes the apparent color of the light and changes the spectrum available to the plants, but does not increase the total amount of light (number of photons) of the desired wavelengths received by the plant. The light absorbed by the filter ends up as heat.
Light that gets filtered out wouldn't hurt the plant, and filtering it doesn't help the plant.
It's more efficient to design a lighting system that produces more light at useful wavelengths, rather than producing a lot of light at useless wavelengths and trying to filter it out.
Correlated color temperature (K rating) is not very informative about the spectrum emitted by the lamp.
penguin