Monster led work light is the best I've found.
Its takes a heck of a beating and continues to work. Everybody was using mine in the shop for some time, and still are to a lesser degree. They have gotten left under cars and fallen out on the test drive and still work fine. Had one bent in about a 30 degree angle and it still works. The one I had at home in my garage when it flooded was floating in about 6 inches of water. No longer works, but was on when I fished it out, but now won't take a charge.
My oldest one is well over 5 years old - that's constant daily use, quite a lot by people who didn't own it if you know what I mean.
It runs for about half a day on a charge, so with 2 you can have light all day constantly. Never timed one for a charge, but I'd guess an hour or less.
Handily they recently started making a bracket that holds 2 of their 122 smd lights and works as an underhood light.
I haven't actually used one of those yet, but one of our mechanics had the older single purpose underhood light from them and it was the nicest I've seen.
Only issue with them is finding one you can buy.
The only place they sell them is mobile tool trucks apparently.
Luckily I got mine at the last place I worked off a USA tool truck. I have had the owner there pick me up a couple more for other people in our shop in the last couple years.
Not sure what other trucks have them, our Snap on guy doesn't carry them I know.
Edit: They get used in a transmission shop and get dropped a lot, at least once or twice a week I'd guess. The plastic hooks on them aren't the best, but work ok if you halfway take care of the light.
Bright green handles/mouldings look dirty fast.