A friend of mine left a couple of these with me to see if I could get them to emit light. I have no idea where he got them from.
After a bit of fiddling and some thinking I got them to emit light. But it was hardly worth the effort.
With 4 LEDs lit it gives me about 58 lux at 1 metre, with 8 about 100 and with all 18 about 220 lux.
Lightbox says 34, 57 and 102 lux or 6, 10 and 18 lumens. Actually those numbers are a bit on the low side as here is quite a lot of useless spill at the sides - like a beam angle of over 200 degrees.
It has a surprisingly pronounced hotspot and only useless spill off to the sides. I can't get my camera to capture it.
But that output pales into insignificance compared to the horror that is its electrics. I'll need to tear the thing apart to get decent pics and I'll also need some daylight.
Here's the beam on high. About 60cm (2') from the ceiling.
The business end
It has a reasonable range of swivel.
The battery carrier part way out. The silver bit is the contact with the LED board. The carrier is also part of the structure. It also makes it impossible to check current draw.
The battery carrier fully removed. There is a groove on the back of it that lines up with a ridge moulded into the body. Those silver bits are the contact with the LED board.
Inside the body tube. There is a beefy spring at the far end. That silver bump at about one o'clock is one of the contacts.