When I used HID, I would always finish out with a 1K 7500K MH lamp and [(2) agromax pure uv(s) on a 15 second per hour timer]) from week 8 onward. Back then I would use a combination of Whites (6000K to 6500K), and super blues (7500K to 15000K) as using those lights at the end of a flowering cycle has shown me that those lights can really pump up trichome production. I would use a US 7500K MH as my main light and (2) 4' ATI T5HO Blue plus, and (2) 4' AgroMax Pure UV(s) [15sph] Now I use samsung 4000K(s) LM301H boards to finish out, (from week 8 onward), but I still use (2) 4' ATI T5HO Blue plus lamps and (2) 4' AgroMax Pure UV(s) [15sph] lamps with my finishing 4000K led(s). And I still use the T5HO(s) with my 4000K finishing led(s) because when it comes to super blues and UV, the LED scene has nothing currently that truly is worth a damn...