When a chest has a light in it, you have two choices.
1. Plot out your hole, drill, and pray to the gods you'll miss the power cable, or...
2. Just disconnect the light power cable completely.
On the outside, the power cable may be in one location to keep it looking neat, but inside the top lid, it could be anywhere.
The assembler would have X amount of cable to use as they fit the lighting fixture and then the cavity is filled with expanding foam.
I have a 350ltr chest and opted for choice one.
If I nicked the cable after drilling, I was going to disconnect the light fixture completely.
I got lucky.