| http://www.w3.org/ns/prov#value | - can improve the intensitiy the light is capable of handling, adding CO2 can improve it as well, and in all areas there is a too much but do not stop there, figure out where this PAR and PUR is from, try to find some measure of how this is measured, ... he is a really good question, because the only people that seem to care about selling PAR are selling LED, floresent is selling Kelvin LED & PAR
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