SOLVED - Dark scene in viewport

Sertorial

I am having trouble with a particular environment I am using in a scene. It's an interior and has a number of meshlights in it.

I can see it fine when I use perspective view but when viewing it through any of the cameras, it is completely dark and I can't see to pose figures or anything. I have tried switching "use scene lights" on and off (usually that allows you to see ok), but that doesn't work either. Any ideas?

EDIT: headlamp intensity was dialled way down. I set it to 1 and it's fine now. Thanks