mjr
Comfy armchair to one person & a plank to the next
- Location
- mostly Norfolk, sometimes Somerset
Thanks for passing it on, but this really doesn't make sense:OK.
This is the reply I got from Cateye when I asked if their lights and specifically the one I have, the VIZ450 was for road use and legal :
"It complies with general UK cycle-lighting standards"
There are no "general UK cycle-lighting standards". There is the British Standard, but it's trivial to see it doesn't comply with that, as there's no conformance marking ("kitemark") on the light.
"provided it is:
- Mounted facing rearwards.
- Emits red light only.
- Visible from a reasonable distance (up to 50 m + easily met).
- Used with an approved steady mode when riding at night on the public highway.
And what does that mean? Do they mean to say it must be used with an approved steady mode light when riding at night on the public highway? Which would imply that the light itself isn't sufficient to comply with the law (RVLR 1989). Or maybe they mean it must be used in an approved steady mode? Which would be odd, as no standard that I know approves only some modes. Either a light conforms to a standard or doesn't.
"Your rear light must:
- Emit a steady red light or a flashing red light (flashing allowed if it flashes at least once per second and has a luminous intensity ≥ 4 candela — which most CatEye models exceed easily).
- Be mounted centrally or offside (right-hand side), and clearly visible from the rear.
They've mis-summarised the law there: a light claiming legality under the flashing clause can only claim that if it only flashes, and it also needs to flash less than four times per second and at a constant rate. If a light has a steady mode, it must also conform to a European standard as safe as the British Standard.
"There are no specific lumen limit in UK law — the RVLR only specifies minimum visibility, not maximum brightness."
It's true that there's no specific lumen limit, as UK law is stated in candelas, not meaningless marketing lumens, but the final bit is just wrong. RVLR states brightness, not only visibility, and does give a maximum brightness in section 27: "No person shall use, or cause or permit to be used, on a road any vehicle on which any lamp, hazard warning signal device or warning beacon [...] so as to cause undue dazzle or discomfort to other persons using the road."
Of course, that's wonderfully vague, so the boundary then gets tested and refined in court, and I don't know exactly where it is now.
The next bit from Cateye is interesting, as they seem to basically admit the light can dazzle and must be put in "low" to be not illegal for night-time riding:
"However, you can technically commit an offence under Regulation 100 of the Road Vehicles (Construction & Use) Regulations 1986 (or the more general offence of “not using lights so as to cause danger or undue dazzle”) if a light is likely to cause undue dazzle or discomfort to other road users.
For context:
- A 450-lumen rear light is very bright — excellent for daytime visibility but can be too intense at night if angled directly at following drivers.
- This is why CatEye include “Group Ride” or “Low” modes, usually around 20–50 lumens, specifically intended for night-time riding to avoid glare.
- Use the lower-intensity steady or flashing mode at night.
- Angle the light slightly downward so the beam is aimed at bumper height rather than straight into drivers’ eyes.
- Use the brightest mode only for daytime running or foggy conditions.
So long as it’s mounted properly and used in a non-dazzling mode at night, it meets all legal UK requirements."
And does anyone with that light use it in "group" or "low" modes and angle it down?
I'd be fascinated to know if the UK retail packaging tells customers that prominently, or indeed at all. If so, that would suggest preparation to blame incorrect use if anyone tries to sue Cateye for a collision after one of their lights dazzles someone. But of course, it's quite unlikely that someone would do so, because that would probably mean a driver admitting they didn't slow/stop when dazzled, as required by law.
Never mind. I've thought Cateye were shoot since they changed all their front light mounts some years ago, trying to get everyone to buy new mounts for all their bikes.