While that fixture is probably a competent unit, the company selling it is full of b.s., this from their web page...claiming the mh is a 10K XM, one of the strongest bulbs readily available. In order ror it to have that poor of numbers there is something wrong with it or it is 10 years old. FWIW my 150 watt halide has better numbers.
Type of lighting: Metal Halide (250w)
Depth: PAR
light to surface (15"): peak-400 avg-350
just under surface of water: peak-91 avg-80
12" under water: peak-87 avg-80
bottom of 55 gallon tank (19"): peak-47 avg-40
Type of lighting: LED(Coral Maxx Ultra 2, 180w)
Depth: PAR
light to surface (15"): peak-700 avg-600
just under surface of water: peak-380 avg-375
12" under water: peak-250 avg-200
bottom of 55 gallon tank (19"): peak-175 avg-165
It is sad when a company trades in rubbish in order to make something else look good. To anyone who has ever held a par meter in their hands this is an insult, the mh par readings are closer to what you will get with a 70 watt MH. The led unit should be a decent one, but it cheapens it by making ridiculous claims.