The Bisun X2 (significantly improved in efficiency for 2011) is a twin-beam LED light unit designed for FX2/DX2 systems.

The unit uses the standard Bisun optical configuration, giving a bright spot beam which also has good down-spill for general caving, and a smooth flood beam for lighting up local surroundings more evenly.

The X2 reflector unit fits into Oldham and CEAG headsets, and is designed to run off nominal 2.4V power sources, so is usable only in 2-cell NiCd or NiMH lighting systems.

In the X2, each beam operates just as a bulb would, with a single fixed power level, and power being supplied to one or other beam via the switch, giving a choice of either a spot beam or a flood beam.
Each beam runs at the same power level.

Compared to regular halogen bulbs, the standard X2 draws much less power (0.3A vs 0.85A) and provides far more light (80 lumens vs 20 lumens).
Non-standard X2s are available on request, giving higher output with higher power consumption.