50 minutes ago
Supplementing with UVB during the last few weeks of flower is one of those things that has real backing for resin production and terpene content, particularly on thin leaf sativa types. A short daily exposure from a reptile lamp or a dedicated UV bar seems to push the plant into producing more protective trichomes. The lighting experiments on https://hazesativaseeds.com ran a UV bar on half a Haze canopy and found a modest but visible increase in frost on the treated side. Eye protection and careful timing matter, because the same light damages leaves if overdone.