I have been using one of the Union 4268 led lights mentioned some pages back for a few months.
It was very easy to open up so I took a few snaps of the innards:
I also measured the DC current taken by the light when hooked up to a power supply.
If I remember correctly like the B&M Cyo it only worked with the DC polarity one way round.
4.0V 150mA
4.5V 280mA
5.0V 330mA
5.5V 335mA
6.0V 337mA
So after 5V it looks like a constant current. If I took the voltage higher possibly at some point some protection
clamps would turn on. It doesn't look like there are any inductors or transformers you would likely need
to do the same current doubling/voltage halving trick as supposedly used on the B&M Cyo etc. The voltage across
the led was 3V, so essentially this is a 1 Watt light.
I bought this light for a leave parked at station bike so cheapness and not looking expensive were a plus.
The light casts a rectangular main patch on the road about the width of one lane. I've mostly been using on roads
with street lights but on brief tests on unlit roads it had been OK. The only directly comparison I have made is
with a HL2000 1 Watt led light. The Union was much better out of the two but the Hella model would be using a
led from about 5 years ago. It would be interesting to compare it with the Axa Pico30 since they are about the same price.
The lens of the HL2000 looks identical to the Pico30.
The Union auto sensor seems to work fine, coming on when I want the lights to be on without obviously staying on when I don't.
The standlight is also good for been seen duties and parking the bike in a dark shed. Unlike the Cyo standlight it doesn't turn
off the standlight automatically, although it can be turned off with the main switch.
The weight of the light+bracket is 100gms.