During the winter, I end up having to feed mostly in the dark. I have a solar powered LED light on a motion sensor that I use outside where I feed. The light and solar panel are mounted on one of my horse shelters. The set up gives a small amount go light, but it is very localized. You have to be pretty much right under it to see very well. The motion sensor works initially, but the light turns off about 3 minutes after it turns on. After that, the motion sensor doesn't respond for quite some time. I also notice the light turns on frequently at night (triggered by wind, the horses moving or other small animals), which is annoying.
Now, I have pretty much given up on the solar light and use an LED headlamp instead. (I bought 4 of them for around $25). This gives me more light and I can focus it anywhere I want to check over the horses and do my chores in the dark. The headlamp also lets me free up both hands for working. If you need to light a broader area, I would go with a rechargeable lantern.