I'm pretty certain at 300W it's a halide clip. I have (not in use- YET) a 400W blue spec HVO clamp on metal halide lamp and a 600W hanging red spec hanging reflector box light- these would be overkill in a normal tank situation- I'm involved in aquaponics and trust me- you don't want a normal sized tank anywhere near these, algae growth is a guarantee. Here are my tank light set ups.
10g fully planted- t8 flora max fluorescent in hood plus a marine land double bright led
with moonlight blues
30g Hospital- incandescent hood
29g BioCube- 10000K 36W full daylight compact fluorescent (coralife) and .03 true blue 36W actinic, plus moonlight blue led
All other mini tanks are unlit/ lit by desktop HO