Thank you for all the input. I decided to go for a ceramic bulb in the end to prevent any possibility of lighting stressing the snake.
Exo Terra Ceramic Heat Emitter 40w
Arcadia Ceramic Lamp Holder & Bracket (screw fitting)
I have ordered the above and now only need a guard. my plan is to take the bracket off the fitting, drill a hole in the roof of the viv and have it like a normal household light. Does the reverse end of the ceramic get hot to the degree where it is likely to burn the wooden roof of the viv or will i be OK?
Also any recommendation on a guard, the ones i can find are 12x16cm which in my opinion are far too long and would look silly hanging from the roof of the viv?
Looking at this:
i will see how it goes but it does not look likely a stat will be required.