ComfortablyNumb
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You mean no apparent impact? How did you determine this?The question of how you are measuring increases in trichomes is my concern.
Also "UV" is way too broad. Even UVB is too broad. But in general light will have an impact. I did some testing on this and shared it all in another thread, but the end result was inconclusive on the actual increase in Trichomes. Cannabinoids went up slightly under the UVB test conditions used. The UVA component brought out more color (purple anthocyanin in my case) than control but had no impact on trichome production.