Looks like my lamp has packed up, wasn't great anyway tbt, was led type narrow beam and was either on or off no dimmer.
The few times I used it was with a mate who had an old lamp with 2 bulbs in one with less power the beam was wider and maybe not so bright but the battery life wasn't much and it got dimmer and dimmer.
So asking who makes a decent one would rather buy something that's going to last rather than cheap and short lived.
Cheers