Hortilux bulbs are made by Iwasaki. They are TOP quality bulbs, but because of the color spectrum, are more suited for freshwater planted tanks.
1 of the best performing 250w MH
bulb is the Iwasaki 6500K. The only problem is the bulb will make everything look quite yellow. You would need alot of actinic supplementation.
6500k 250W Iwasaki Single Ended Bulb - English
As a comparison, these are the results of a few different bulbs when using an electronic ballast.
The Iwasaki 6500k puts out 110 PPFD (a measure of PAR).
The Radium puts out 66 PPFD.
The Phoenix 10K SE puts out 94 PPFD, and the Phoenix 14K DE is 73 PPFD.