One more thing, as far as I could tell, most researchers don't believe we know every frequency plants use. The methods used to discover what frequencies are absorbed by what substance, and whether the substance is altered by that absorption, are not precise enough to detect the light spectrum equivalent of 'micronutrients'. It is entirely possible that some obscure frequency is liked by plants as a fraction too small for us to yet detect. Therefore I have assumed in previous experiments it is sensible to mix in some broad spectrum whites, such as the daylight coloured ones with yellow phosphor on a blue chip.