Keeping reptiles equates to using electricity, more than what we’d really like to see on our power bills. That’s just part of the game with reptile keeping, and all that’s left to decide is simply how much power you can afford to pay for. Creating heat from electricity can be costly.
That said, I prefer to use ceramic globes for overhead heating because they just last longer than any globe, either incandescent or halogen, that I’ve used. I believe the thermostat / rheostat/ whatever you use function, just kills globes because globes, and especially incandescent ones, aren’t meant to be regulated in such a way and are happiest just burning at full tilt day and night until they eventually die some years down the track. I use T5 UVA /UVB fluorescent reflected globes for daylight, set on a timer, again for reducing the cost a bit since they’re not being used to heat the enclosure. Ceramics obviously don’t give you that “sunny day basking spot” but the reptiles can live with that since their enclosure is warmed. I also use a heat mat in a larger enclosure as well as the ceramic, and it’s connected to the day light so it heats up “during the sunny day” as it were, and that hopefully provides something like a nice warm basking spot on their bellies.
Oh and by the way, avoid dropping a daylight basking heat globe into the enclosure; whilst I’m certainly no expert on reptiles, I have read that reptiles are adversely affected by light coming in at a low angle, into their eyes. They all have eyebrow ridges for a reason, and they’re designed to be getting their sunlight from directly overhead.