Graham Bullough wrote:Furthermore, of those who do use lights, too many seem to have dim ineffectual ones and perhaps still believe somehow that they are reasonably visible to other road users. Considering that reliable and bright bicycle lights are now widely available at reasonable price it's madness for cyclists to not to use lights after dark or during adverse conditions such as heavy rain.
It's not that straightforward, actually.
The reliable and bright lights aren't legal. While the police probably will accept any bright white / red (as appropriate) light, the same is not necessarily true of the weasels at insurance companies.
Until very recently, LEDs were not legal (though they were more reliable and brighter and lighter and better in every respect) because the BS required a filament bulb, and specified a MAXIMUM power of 3.6W (or 2.4W if it was a halogen bulb) and no minimum power (but there was a minimum battery life, which encouraged manufacturers to use low power bulbs). That is, the dim ineffectual lights you saw were probably the legal ones.
LEDs are now theoretically legal, but if the light has a continuous mode (rather than only flashing or occulting) then it must be BS approved. All of them do have continuous modes, and almost none of them are BS approved, meaning that they are not legal. I know of one not-very-popular model that is BS approved, but it's not approved when fitted with the mounting bracket it comes with, only when fitted with an optional bracket it's nearly impossible to buy and doesn't fit every bike.
There's potentially a get-out-of-jail card in that under EU legislation a setup that's legal in another EU state with equivalent legislation must be legal in the UK. The trouble with that one is determining what is equivalent - and in the limiting case Greece does not require any bicycle lights after dark, so does that mean no lights is legal in the UK? It needs case law to determine which country's legislation is equivalent, I think.
So, ranting about dim cycle lights is all well and fine, but you ought to bear in mind that the cyclists you're lauding (the ones with bright and effective lights) are almost certain to be breaking the law - there just aren't any bright effective cycle lights that are legal to UK law (though there may be to EU law, possibly).
Admittedly, the bright ones probably don't know they are illegal, and the dim ones probably aren't dim because they are carefully complying with the law, but that's the end effects.
In case you're interested, my main bike has a front and rear light that each comply with German law (but not UK), I have a second rear light that is the one LED one that is BS approved (but it's not approved as fitted because the approved bracket doesn't fit my bike) and I carry a spare front and rear LEDs both of which are bright and reliable and don't fully comply with any country's law (as far as I know).