Yes, serve the same purpose? You have to remember that lights used for reptile cages are not 250 watt bulbs if they were they would fry the more critter in the cage. All professional warming boxes come with a 250 watt heat lamp bulb which gets far hotter than a reptile bulb. I remember the post where she was talking about this. She pm me about that and said they were 250 watt bulbs. There agian Kathee as I told you in my pm to you they are a matter of personal preference. No 2 chefs will have the same designed box at least not from what I have seen. The reptile bulb would proably work but it would take more than one. Checkout this link www.pastrywiz.com
they have a link there for sugar equipment and a pic of a warming box. You could also try www.chefrubber.com
both of these sites have sugar work equipment I don't know about warming boxes because I have never tried to get them there. You might also try calling a culinary school that offers courses in this type of work one in particular is www.notterschool.com
it is located in Florida it is ran by the world renown Ewald Notter one of the best sugar artitist in the world. Thats the thing about this type of art you are only limited by your imagination. Look around your home you proably have most of what you need already there, agian the box is just personal preference, unless you want to spend $350 to $400 for a professional box.