At a couple stands I have been using inexpensive solar powered IR sensor security lights with something like 150 to 200 LEDs purchased off ebay. I made sure I get ones that use replaceable rechargeable AAs as the power source and replaced the cheap chinese ones in the light with name brand ones. They are very bright and can be triggered multiple times all night after a sunny day.
A new light I have been trying found on ebay and bought off amazon is a solar street light I bought for under $60. Search for 600X light on those sites. It has three settings 750-200-100 lumen brightness and published lasts 2-7-12 hours, but I am getting over 4 hours on the 750 setting after a sunny day. Testing the 200 setting it was still on in the mornings. It comes on a dark and stays on. I mounted it on a tall metal pole with an inside diameter wide enough to slip over a T post, so I can put it anywhere I can drive in a T post. If I want to adjust it, I just lift the pole off the T post and lay it down. The LED housing is made of all metal and glass, not plastic. So far I really like this one. https://www.amazon.com/Light-Brightness-Streetlight-U-Bracket-Diameter/dp/B01DG9EB60