In article , Dragon Slayer wrote:
over on RC I posted this question and got a recommendation that HQI (double
ended bulb)250's give the equivalent light of 400 mogul based
bulbs..........any truth to it?

none. The common HQI bulbs tend to produce a different spectrum, but
produce the same ammount of light watt for watt as a mogul based
bulb.

http://www.animalnetwork.com/fish2/a.../2/default.asp

The HQI are nice lights if you can find them. Locally HQI are 3x the
cost of mogule bulbs.