I believe IMHO,
It's the same reason why the price is so different between normal tanks, and ADA tanks.. It's always the cosmetic issues(i think)
The ones we use that hangs above the tank, are more err.. aesthetic in terms of looks as the MH and the provided T5hos(or PLLs) are all encased into one case..
The industrial one, may look , well, Industrial. Unless you have a hood to cover your tank(well ventilated) you would be able to see the casing, etc. etc.
But once again, it's up to the buyer/tank owner, if he's going full budget, they usually go for these industrial ones.. If you have extra money to play with, they go with the sunsun MH fixture, even more $ they go for arcadia or ADA LOL!!!
The bulbs on the other hand, if it's the range of 6500kelvins to 10000kelvins, you're good to go.. (Preferably try to get 8000kelvins.. but anything in that range is doable...)
Hope this helps. I'm still new to the MH quips.
Drew
well... i guess so... haha...
me not into MH lights as well.. jz wondering why there is big difference in price since someone told me he found 1 rm500 jz for the casing...
btw, does MH lights with 150W consume more or less power compare to normal "lets say" PLL lights with equivalent (total up) 150W??...