Most of the new LED headlamps quote light power in lumens. Over the years I have had many headlamps for camping, mountain marathons and caving.
Can anybody give me a rough idea of the lumens for the following headlamps that I own or have owned?
This would give me a benchmark to judge the LED lamps.
Petzl Zoom from 1985 with standard 3.5 V bulb and zinc oxide lamp battery
Upgraded Petzl Zoom from 1995 with 3 x Duracell AAA and halogen bulb
Oldham Cap Lamp on spot
Oldham Cap Lamp on wash
Speleo Technics FX2 on spot
Speleo Technics FX2 on wash