Try the custom AI to help you find products that Reddit loves.
They're cheap, bright, and you don't lose any height in the room. Of course exposed bulbs are fine, just tossed out a suggestion. My shop has a ton of these and honestly they work fine, but it's only an 8' ceiling so in my case I defintiely wish I didn't have to worry about hitting the things when moving lumber around. His garage may very well have open rafters and he can recess the shop lights.
How big is your enclosure? 250 watts is serious power for an enclosure. I run total of 200 watts in my 5x4x5 enclosure in the winter and that is enough. Enclosure must be sealed for it to work, but CWD enclosure must be sealed anyways. For fixtures the most economical is to use porcelain Leviton fixture. They are very reliable and withstand all you can throw at them.
Halogen lights on dimmer work nice for a day heat, paired with some t5 UVB. Ceramic bulbs on pulse-proportional thermostat work good for night heat.
Home Depot/Lowes. You need some 2x4s and either 1/2" birch plywood or cheaper OSB(oriented strand board) and make sure you water seal them with 2-part epoxy/fiberglass resin. Things of that nature.
For light and heat you will need cheap ceramic bulb holder. Few of them.
Very imprtant do design and draw everything first and then have them cut everything for you properly to the length.
For the front you can use plexiglas - that is going to be the most expensive purchase. And also the trickiest to figure out how to make an opening door with it.
With one of these.
Leviton 9875 Porcelain Outlet Box Mount, Incandescent Ceiling Lampholder, Keyless, White https://www.amazon.com/dp/B00002N7IM/ref=cm_sw_r_cp_apa_7zsIBb1A7SATB
If you already dabble in home automation or want to get started, you could hard-wire this type of fixture each of them, then install this recessed z-wave sensor. In this case you'd also need to get smart bulbs (I like Osram LIGHTIFY bulbs. You can get on/off only ones for $20). Then you'd configure your hub to turn on the lights every time the contact opens, and turn them off when it closes.
chain of low wattage halogen bulbs is what I use in my arboreal monitor lizard enclosure. 8 of them total wired in pairs. You will probably need 4-5.
Few benefits to this setup: you can individually dim each pair to fine tune temperature. You can individually replace bulbs in each pair to fine tune even more(for summer I replace some with low heat leds). You can also automate each pair to go on/off at certain time to emulate dusk/dawn. Chain of lower wattage lights doesn't affect humidity as much.
Here is how it looks in my enclosure. It is evening, so most of the lights are off for the night.
All you need for that is piece of plywood, number of inexpensive ceramic lamp holders, and 35 watt lensed flood halogen bulbs.