In reply to Paul Crusher R:
UKC won't let me post an ebay link but search for the below and the first result is what i have
20W 30W 50W Portable Hi Power White LED Work Light Rechargeable Flood Light IP65
I have a 50w version of this for lantern sessions. It's waterproof quite slim line i just slot it into the top of my moon warrior pad. It lights up the world and last about 6 hours! There are much cheaper options but none come close to this that i have seen.