I avoid/ed the Dennan lights like the plague
On average probably over 50% were US when opened. Although a little of the big side for rod top use, the Liddl lights are best. Although any thoughts of night fishing is out for me these days, at least when alone.
I always found that after only a few hours use if the lights are stored in the freezer (Wrap them in a piece of kitchen paper then wet before freezing) they can be used 2-3 times. Just take out the frozen wrap when needed and it will be defrosted by the time they are needed. I always keep my unused 'starlights' in the fridge. Probably a good tip for retailers to follow.
I used to buy the Liddl boxes in 3's, and as I said, keep them in the fridge
At least when using the Liddl lights, the sea trout anglers couldn't claim they didn't see my rod
I also bought the 2 in a pack Drennan Beta lights, they were so dim I couldnt see them when I dropped them