LED cycle lights have been around for a long time now. The trouble is although most of us think they allow motorists to see cyclists more clearly, many were actually illegal. Well that law - the road vehicle lighting regulations or RVLR - changed in October 2005. Seeing as the nights are now looming in and many of you will be buying new bike lights, we thought it an appropriate time to reiterate what’s what with bike lights.
LEDs
The RVLR now allows a flashing light to be attached to a bike if it
(a) emits a minimum light output of four candela (i.e. the strength of four candles, queue the Two Ronnies); and,
(b) flashes at an equal and constant rate of between 60 and 240 flashes per minute.
To summarise: a not-too-bright steady pulsing LED is fine - out goes your Nightrider strobe.
Unfortunately the British Standard regulation for cycle lights has not as yet been updated. So you may have a light that complies with the RVLR which will not automatically comply with British Standard and visa versa.
The Law
You are riding legally if your front and rear lights meet either the RVLR and/or British Standard 6102-3. This means you can also mix standards between front and rear. For example:
Cycle 1: is legal because its front light in constant mode complies to British Standard and the rear complies to the RVLR in flashing mode.
Cycle 2: is legal because its front light complies to the RVLR in flashing mode and the rear complies to British Standard in constant mode.
Note: the RVLR was set considering the requirements for riding in areas with street lighting. Therefore, RVLR lights are not required to give any ‘beam of light’. This can mean they more useful at ensuring the cyclist can be seen by other road users. A four candela front cycle light would not be suitable for riding down a dark road, even if it’s technically legal to do so.
The following lights comply with RVLR when used in constant flashing mode:
Front lights: Cateye EL-320 £29.99, Cateye EL-410 £29.99, Cateye EL-220 £24.99, Cateye EL-135 £19.99, Cateye HL-LD270 £12.99, Cateye HL-LD150 £12.99, Cateye HL-LD130 £9.99
Rear lights: Cateye TL-LD 270 £12.99, Cateye TL-LD150 £9.99 , Cateye TL-LD130 £7.99
The following lights comply with British Standard when used in constant mode:
Front lights: Cateye EL-300 £28.99 , Cateye HL-500BS £12.99
Rear lights: Cateye TL-AU100 £14.49, Cateye TL-LD260BS £12.99
The Department of Transport’s Guidance about lights on pedal bicycles can be found here.