Every grower I know uses HPS's with enhanced blue spectrum. Back in the day we didn't have these and would use 1 MH for every 2 or 3 HPS's. The Hortilux is probably the most popular blue enhanced HPS bulb on the market. I prefer Digilux due to a little more lumens and the fact that I run digital ballasts and they are designed for digitals.They cost about 50% more than standard HPS bulbs.
Anyone think they are worth it?
If these bulbs are better then why are not everybody using them?