My old cheapo Caldwell chronograph does pretty well outdoors, but is absolutely worthless indoors. I'd really like to be able to set this up at an indoor range I frequent to do some pistol load testing. I rigged up a lighting kit on the top side of the diffusers. I'll take it out there, maybe tomorrow if there is time, and give it a whirl. Just trying to save a few bucks rather than having to buy a whole new chronograph with a purpose built indoor lighting system.