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Yes I have an 18" and my cage width is 18". So just get it so the bulb is about the length of your cage width. So 18" wide cage-18" bulb, 24" cage-24" bulb. Or longer bulb if you have cages next to eachother so you have one bulb on two cages
It depends on your fixture. I have the Zoomed fixture which is 30 inches and that fits a 24 inch bulb. Doesn't your fixture allow for room on each side where the bulb screws in for the electrical componenets, therefore making the bulb smaller than the fixture? If he orders like I did, the bulb will be smaller than the fixture and he needs to be aware of that.