Bisun - making a range of LED lighting systems for cavers.
Complete twin-beam caving lights and drop-in upgrades.
Bright spot beams for Duos. Dive and Photo lighting.

Bisun Solo

Spot-beam LED units for Petzl Duo headlamps.

Using a modern high-efficiency LED with great spot beam optic, the Solo gives a far better spot beam for your Duo than either the regular halogen bulb or the common LED-based screw-in replacement bulbs.

The power draw of the standard Solo is similar to the common screw-in LED bulb, and around half that of the regular halogen bulb, but but with its powerful output and good beamshape, the Solo completely outclasses both.

Compared to the common LED bulb at tightest focus, the Solo spot beam is both more intense and significantly wider, and outside the spot beam area, there is much-improved 'spill' light, so as well as being a good spotting light, the beam is also much more usable for general caving.

With efficient voltage-converting electronics, output regulation is rock-solid from start to finish, as can be seen below.

The Solo is quick and easy to fit (instructions here).

The Solo is electronically protected against reverse polarity, so fitting one into an older headset with 'incorrect' polarity or fitting batteries incorrectly will not harm it.

A standard Solo has an LED output of ~120 lumens, but alternative power outputs are available on request for people with different power consumption requirements.