Back in the day. They use to sell this Pyrex glass tube for baking bread. Not very popular because it looked like you'd have to tear the bread out the tube after cooking.
Well, some stoner decided to stick a bulb in it. Duct on both sides and invented what's called a 'Cool Tube'.
Then another stoner followed the design but instead of a glass tube. They made an enclosed hood. With two drawbacks. If the bulb couldn't fit through the 6" duct hole. You'd have to remove the glass face panel. But the room inside the hood could hold a bulb from 400w to 1000w. With the 1000w bulb being the fattest. I've used both a cool tube(made it, 400w) and an enclosed hood(bought it made, 1000w).
You shouldn't have an issue with the bulb fitting.