What watt bulb should I use?

[DrScales]

So I have a juvie beardie, and he's a little older than a year. I'm not sure if that's important to know, maybe hotter bulbs are a bad idea? Anyway, Timmy lives in a 40 gallon terrarium. I've been using a 75 watt bulb for awhile, but I figure that moving on to a higher watt bulb would be better since he's in the 40 gallon now. His highest basking spot is a little less than a foot away from his lamp, so I was thinking maybe I should use a 100-watt bulb?
Thanks, Timmy gives his regards.

 

[CooperDragon]

It really comes down to heat gradient that the bulb is creating in the tank. You could use multiple lower wattage bulbs to create a wide area of high temperatures, or you could use a higher wattage bulb and sit it a bit further away for a similar effect. You could move to the 100w and just raise it up a bit until you're getting 100-105 or so in the basking area. It takes a bit of trial and error and some tweaking to get the lighting just right.

 

[DrScales]

Alright, yeah I think I'll just get the 100 watt bulb and get him a higher basking spot. Thanks for the answer!