Great headlights, I put 16 of the 4 inch deflectors in my garage and they went from underused space at night to bright daylight. Business. It's best to use a 4 1/4" hole saw to drill holes, quick and clean holes that fit just right. No hassle with templates or drywall handsaws. With low ceilings, the 'baffle' style lights are easy in recessed the trim, this gives less glare on the sides and I think they look a little better Repeat this project, I think I'd go for a 6" for the garage, a bit more power and light output would be nice though 4" is bright enough. I found that with 16 bulbs I didn't need a dimmer at all, although indoors a dimmer would be nice.