Working after sunset means your torch has to last the whole shift, survive dust and rain, and stay bright enough to see across a field.
Start with runtime. A torch rated for 12 hours on a full charge will comfortably cover a night shift with margin. Next, look at water resistance — an IPX4 rating handles rain and splashes, which matters during the monsoon.
Finally, check how it charges. Solar plus AC gives you a fallback when the power is out, which is exactly when you need light most.