I am looking for a light for a 20long sump witch is divided up in 3 sections, what is best and the safest to buy
You could go online and get a specialized refugium light or if price is an issue, I'd suggest going to Lowes or HomeDepot and getting a bulb around the 6500 Kelvin range which is close to "daylight". You could even get a self-contained floodlight that doesn't even need a reflector. I had the same question but thanks to Marcs advice, I got a new bulb closer in Kelvin to the 6500 range and my Chaeto has tripled in size. - gettareef