A driver of a vehicle traveling at 60mph misses seeing 26.8 metres of road per second of staring at the phone. Time taken for the eyes register what's on the road after glancing down, pressing a button and/or swiping to read something on a phone screen, looking up and refocusing, could be five seconds looking at a social media post, or 134 metres of road view missed. Or even more if they are typing out a response. Therefore a rear light needs to be extremely bright to be noticeable at 134+ metres to a driver's eyes looking down at a phone.
Fortunately, there's no maximum brightness stated in cycling laws for lights, but unfortunately there are rozzers who would very likely object if they're dazzled by a 1800LM rear bike light, but that or brighter is required imho.
The Road Vehicles Lighting Regulations 1989 (“the 1989 Regulations”) make provision about the fitting and maintenance of lighting equipment for motor vehicles and trailers used on roads. These Regulations amend the 1989 Regulations to give effect to the requirements of Article 6 of Directive...
www.legislation.gov.uk
So far, cops have ignored my 1800LM headlight. They've driven by and not turned to engage in hot pursuit. I'm hoping they'll also ignore a 1800LM headlight made red and used as a rear light - I think that it's shocking red 1800LM flashing mode will very likely be a problem, so I'll go with it's approx. 900LM mode to start with at night, but will use 1800LM flashing red during the day.
It'll be soldered to the battery through an inline blade fuse and handlebar switch. If I use the same switch for both front and rear 1800LM lights, I could get both of them flashing in alarming fashion when approaching intersections and roundabouts by switching to that mode, which is activated by rapidly turning off and on twice. I'll need a separate switch per light, if I want the option of different modes for each light.
Fuck it - I'm going to do it. I've just ordered a second one of these to make red for the rear rack. It's a bit big for a rear light, and will probably need a longer aluminium sheet on the rack to make room for it, plus possibly a diffuser plus my ebike battery, increasing the folded size of my bike a bit. If I get booked by plod, it'll be handy as a spare or second headlight. It's price has reduced since I bought one last year, which might mean these will be phased out.
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Independent control of lights would be safer, so I've ordered this switch. There's no room on my handlebars for the wider variety. This isn't on ebay or Amazon for UK delivery, so it'll take about 2 weeks to arrive.
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