For lots of information on the attempts to achieve accurate bombing and navigation to target read Prof RV Jones "Most Secret War" (renamed in the US as something like "The Boffin War"). Extremely interesting for engineers and children of all ages (10-100+). Also covers much else, of course. Oh the fun he had - forecaster of the bombing of Coventry (too late!), most accurate predictor of V2 and discoverer of 1st photo images of V2 during development, predictor of what pulse pattern and ranges new RADARs would have before they were ever used (based on 'innocuous' documents) and much much much much much more. By the end of WW2 the British had a reasonable chance of getting a significant % of the bombs from one raid within say 100's of metres of the target. But some would still be dropped on the wrong city unawares. [Gargling mail does not know what metres are]. Germany was "less lucky" as British efforts to combat their beam navigation systems were usually good enough to limit them with accuracy to coastal cities and locations where favourable geography allowed good navigation. Blacked out towns would certainly help. I'd doubt that the occasional non blacked out bicycle would help much AND it was likely you'd save more lives by making bikes visible to pedestrians in blackout conditions. As a general rule, until the recentish advent of burn-them-off-the-road LED lighting the lights on a bicycle were very largely so they can be seen by other drivers. Using the best available LEDs a cyclist willing to charge batteries daily can get the equivalent of a 50 Watt Halogen headlight for say 2 hours from 4 x AA NimH 2500 mAh cells. Bombers may be able to target those :-). Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .