Sounds like your L2 level is programmed to the lowest setting, which is barely visible, and I think may be for NVG use.
Here's what I'd try,
- go to the low beam setting. Double-click to toggle from L1 to L2. Your L1 should be visible. To reprogram the L2 to a brighter option, double-click five times, after that each double click will cycle through the L2 options (there are three).
I bought a Zebralight last fall (600 series) and have been using in almost daily this winter. The instructions are not exactly user-friendly. I fiddle-fuq'd with mine for a few minutes, and it all fell into place.