can anyone tell me wut is the difference between a regular home light and the ones we use for aquariums
Lots of differences - without getting overly technical the 2 main differences are:
(1) Intensity & spectrum. Intensity is the ability of the light to penetrate the water (usually related to wattage). Spectrum is the *usable* light (usable by corals).
(2) Color temp. This is the big reason why "home" bulbs are not usuable for reefs. The lowest suggested color temp is 6500k. Usually home lights, greenhouse bulbs, etc., can be as low as 3k - 4k. These bulbs emit a very ugly green-yellow light.
For a reef tank. you'd want to look at either VHO
, or some combo. thereof.