[prydey]

A gopher/wheelchair battery will be fine.

That light bar draws 1.2a. I'm no sparky but in 8 hours I think that would equate to about 10ah tops.

I have a set of hardkorr lights similar to that. 4 x 50cm. I used to run them off an 18ah power bank. Never needed to run them for 8 hours but it had the capacity to if needed. As long as you have the ability to charge up your power source each day, then you can get something pretty cheap that will 'do the job'.