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.