Well it was utterly lashing it down earlier, so bad I could see a cyclist up the the top of the road taking refuge in the bus shelter. Pointless post, except his rear light was like a beacon. On strobe it was like BAM-BAM-BAM-BAM-BAM red light. Only problem was it was raining so damn hard I couldn't bring myself to walk up there and ask the rider what it was. The best I've seen so far are those Exposure ones, British made and amazingly bright and visible. Painful to follow someone riding with them, and I was behind a guy with a pair of them. Only problem is the price (~£40 each) and the fact that they use CR123 batteries, so will cost a fortune to run or create a one-light environmental battery disaster unless you use rechargeables.