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What is now labelled as the claud butler excaliber 7 (it was Raleigh branded when I got it) is a '3watt' (roughly 120lumens) light that slides on/off the bike really easily and the fitment of the holder is a 30 second job.
Takes 4XAAAs, 2 settings flash and main beam, the flash is as bright as the main beam and not too fast that it impedes other road users
It will also do nicely on constant for those slightly darker roads and if you're familiar with the road surface/area you can do about 14-15mph if it's completely unlit.
I've had mine for about 5 years and has being subject to monsoon like downpours and temps down to -8C and still going strong. Not the longest lasting compared to your standard blinkie by any stretch but for £8 it's a versatile light. Raleigh also did a brushed silver '1 watt' RSP job that lasts longer and is equally as weather resistant.
Any decent, cheap, durable, waterproof, small commuter blinkies worth considering v these days? Most Cateye is shit. Everything else dies v after one winter..