Slvoid, it has been so long since I use a carbide light my recollection is a little dim (pun intended). maybe something like a 5 or 10 watt incandescent? For a better answer leave a message on a chat list for cavers. The light level is adjustable. Also the flame can be used to leave sooty markings on non-combustable surfaces. Try that with a TrailTech 30 watt HID light.