Helios by Hagen has single lamp in a fixtures with a reflector. they come in 10K, actinic, pink, blue etc in 12", 18",24", 36" 48" I love mine...only 1" wide and a 36" gives about 30 watts, and costs $18.99 each. the 48" is about $25. You can daisy chain them with a short connector cable that...