CBF125 Headlight bulb

[wots]

I bought a new H4 OSRAM bulb, the clearer ones. However I've just noticed that the existing is 35w and the new one is 55w. I take it this is a no go then? As there would be an extra 20W load and the headlight unit is probably not designed for that extra bit of heat?

[Matt-]

No don't don't do it, has the effect of a overload not only can damage your bike, can also brake the bulb, i suggest getting the correct one.

Matt
____________________
RIP jack (wheelie king), you will never be forgotten.
Current Bike's - Road Legal TZR 125 Pitbike, Aprilia SR50R 2010

[wots]

Thanks, thought that was the case.

[Matt-]

Just take the bulb in to your local motor shop, and show them the old bulb and they can match it up to a new one
____________________
RIP jack (wheelie king), you will never be forgotten.
Current Bike's - Road Legal TZR 125 Pitbike, Aprilia SR50R 2010

[wots]

Electrically I'm quite savvy, which was why I thought the extra loading for wiring and the headlight can only handle the heat from a 35W bulb by design. I just wanted to confirm this was the case, which you've done. Cheers

[Islander]

The main risk is overloading the cabling which can cause the copper to heat up and can eventually melt through the insulation. If you have a fuse specifically feeding the lights it may weaken that too. You've effectively increased the current demand for the headlight by 50% from approx 3 amps to 4.5 amps.