A regular light would be ok for the fish but the rock might not flourish with life leaving the biological part of filtering it kind of weak. Is it like one of those t8 or t12 bulbs? You can usually buy a better bulb with a better frequency for marine life.

These stores sell OK lights for about $100 or more. They are T5 lights I think and would do well on your tank for live rock, though I'm not a reef person. The fixture in your hood probably won't fit or be able to power a high enough wattage bulb.

There are MUCH better deals on T5 lights that can be ordered.

I do agree. You will eventually get rid of the hood. I tried keeping mine but just got in the way. Coralife has these simple 36" t5 lights available for around $60. I really recommend ebay if you are on a budget. Any lfs, weather its a chain or local sell products at market prices which are higher than ebay.

ya, i had the same thing on my 46 gal bow. The truth is it will get dirty with salt creep and other minerals. If you have the water touching it, it will not allow for oxygen exchange. This is how my light is set. You can also see how the powerheads are pumping water over the surface for oxygen.