The pic on the right is called an envirolight or a form there of, and has a ballast built into the bulb. The pic on the left has the ballast built into the reflector and has a bulb that does not have a ballast. This is the light from home depot. Do not buy an envirolight as it will not work unless your hood does not have a ballast.
You need the bulb that matches that ballast so if the ballast is 65 then get that one.
growbe Reviewed by growbe on . what is the kind of light is this? I have the ballest for this kind of light but I can't rember what kind of light it is. I wanted to look it up on the internet to see about how much they would cost me. and maybe goto homedepot and buy one. but I don't know what kind of light they call it. I had onefor 3 years. it worked great but then after 3 years of useing it. it burnt out on me. and now I wanted to get a new one. cuz I could save more room in my flowering cab. thanks for UR help. Rating: 5