In case anyone is interested I’ve just bought two new lights that I am very happy with.
The new Clubman CB2 spotlight (www.cluson.co.uk) with separate power pack which is just fabulous (you can get them from Alana Ecology in the UK). It is lightweight and the battery pack is – I guess -a over a kilo. But kilo for kilo offers the longest life of any battery I have used – about 90 minutes on full beam. It has a 50w main bulb and a second 10w bulb for local work. Plus the connection between the battery and light is through a rugged socket.
I also have a very small but high-powered Tiablo A9 flashlight – it is tiny but has an amazing beam and battery life (and is also rechargeable). I got it in Thailand.