If that is a 500W halide I would be inclined to stay well away since a 500W point source far exceeds anything that nature throws at corals (from both a light and heat point of view). Garden halides are certainly an option and one that I frequently recommend. Either a 150W or 250W is fine but remember that these will give a good intensity to a 2'x2'x2' volume of water. You will however have to change the lamp/bulb to an aquarium lamp of equal wattage and what ever colour you like; 10K, 14K or 20K it's up to you. What are the dimensions of your tank and what lighting are you using all ready? Also remember to think about air flow around the tank since halides get hot and can quickly raise the water temperature.
Well I hope this helps
Regards
Agree with Musho, 500 watts is NOT a typical halide bulb. Halides come in 70, 150, 175, 250, 400, and 1000 watt types. Halogens come in incriments of 500 watts. I'd stay away
All HALOGEN bulbs are bad for marine tanks, yes. Halogens output almost solely red and yellow light which symbiotic zooxanthellae that live in our corals cannot use. Hair algae and cynobacteria can though
But am i right in saying the biorb has a halogen bulb in it???
But am i right in saying the biorb has a halogen bulb in it???
They do and you couldn't grow coral under one of them either!