They do sell 125 watt bulbs and higher even. Just understand it has everything to do with the efficiency with which you heat your cage. For instance, screen top = very low efficiency or it takes a lot more wattage to do the same job (the heat goes up and out immediately). The cages I have for my adults are pvc with glass fronts (no open top). They are 4'x2'x18" or something like that and I heat each cage with a single 50 watt halogen flood. And it is almost too much, that is to say it is hard to get the cool end as cool as I would like. Just something to think about.
Also, just to contribute to the conversation, it is not about any one temp. being better than another. My point is that I feel it is important to give the animals the choice, to give them options and then let them decide. At times they will use temps from 70 or lower up to 140 and everywhere in between in my cages. They might even use temps outside this range if given the chance. I have seen this because I give them the choice. If I have temps only between 80 and 110 then I would never have the chance to witness them using any other temps and of course they would never have the option to use any other temps.
You might also think about, in regards to another post on this subject, what range of temps do you think beardies have available to them in the wild - through all the seasons? Say in the dead of summer, in their native habitats, how hot do you think surface temps get then?
In my experience, burns are not a problem using the temps I mentioned. But the particular bulb can have an effect on that. I use wide flood bulbs (not spots). Here are some pics of beardies exposed to the range of temps I mentioned.
http://forums.kingsnake.com/view.php?id=735184,735184
All of this and everything else on this forum is only for you to consider. You will make your own decisions regarding how you keep your animals. I just encourage you to let your husbandry revolve/evolve around the actual animals and not some static care sheet or what someone says. The animals change all the time - your husbandry and the way you think about it should too.
Good luck,
Ian