Lighting.

[phoebes15]

I am building a 6foot by 3foot by 1foot tortoises enclosure and I need to know if I need more then one heat dome and uvb dome . If I do how many do I need ? Xx

 

[wellington]

Is this for an adult or hatchling? What species? Open table or enclosed chamber enclosure?

1 foot high? Is not high enough. Should be at least two so you have room to hang the lights. Unless of course this is not a closed chamber but an open table.
An open table is only good for subadults and adults, not hatchlings 3 and under, they need a closed chamber.
As for uvb, it should be a straight tube flourescent not any of the kind that would fit in a dome.
As for the dome for heat/ceramic heat emitter, only you can know that when you check temps when it's up and running.
If you get fairly cold then you likely will need two, specially with an open top.