I bought a $27 rechargeable stand mounted floodlight off Amazon that's amazing. Battery lasts for hours, I've used it for 4-5 hours at a time and not managed to kill it. Comes on a little tiny stand that's flimsy and comes loose, but if you just bend it back and tighten the thumbscrews every time you use it it's fine. Could rig up a bracket to mount it on an old camera tripod from a thrift store easily.
Also I bought the cheapest pair of rechargeable bike lights on Amazon with Micro USB connectors for like $9.99 and have had them for a fucking year now. Usually lasts 2 rides (15 miles average each) before they start to die. Run the front one on half brightness normally.