You can buy an LED Minimag upgrade kit at Home depot for something like $16, and increase the light output of your borescope without paying big bucks. With a steady hand, you even can take decent photos through the eyepiece. Might take 2 or 3 shots to come out sharp. I stuck in a eyeloupe magnifier lens($3 at flea market) in front of the LED to get the light concentrated even more
