Lighting question for smaller tank

[spreerider]

MH- Metal Halides, very high par output in small package, not very efficient, generate high amounts of heat. Usually best bang for the buck for larger tanks especially when considering bulb replacement (1 bulb verse 4). Bulb life around 12 months.

MH are the most efficient lights that we can get for our reefs, the only more efficient light available is LPS (low pressure sodium) they are street lamps and grow lights for "farms".
Some new LEDs claim to be more efficient but if you actuall get info on the individual LEDs used they have a Efficiency less than MH.