SOHC.co.uk Forums > CB500/550
H4 headlight
mike the bike:
The fuses are 1¼". Domestic fuses are 1".
JezzaPeach:
Some more info on fuse limits:
https://www.pat-testing-training.net/articles/fuse-operation-characteristics.php
JezzaPeach:
Update. New led headlight bulb fitted. Better clearer beam. Thanks Trig 👍
An H4 headlamp only takes less than 1amp more than the original spec.
A 15amp fuse can take more than 25amps for brief periods, so normal running with H4 full beam and other constant drains will only use about 9-10amps. Brake and indicators going on momentarily will be well within the 25-30amp ‘blow’ capacity.
The main benefit of a super bright led headlight seems to be just that. Better light at night. And the main cause of a 15amp fuse blowing may be a fault somewhere.
Rob62:
--- Quote from: Trigger on August 14, 2020, 08:50:43 AM ---
--- Quote from: Lobo on August 13, 2020, 10:52:02 PM ---Sye... whilst power divided by volts indeed gives amps it’s not the full story when resistance is then bought into the equation. Your post fails to explain why lamps brighten as you increase the voltage - which you’ll know from 1st hand experience. The current (A) actually increases as you increase the voltage through the filament...the power rating of a lamp will be only be valid at the stated voltage .
Anyways, please don’t take my word on it, but rather google the explanation.
Yea, Deltarider, horses for courses. I’m gonna take a punt on the LED headlamp bulb, and will report back in due course. They annoyingly come in pairs... so if fail early I’ll have a spare 😂.
Trig... you say you’ve got LED replacement ‘globes’.... how are they performing?
--- End quote ---
I have had the cob type fitted to a 750 and a 550 for about a year or so and the 750 is just over a couple of thousand miles, since fitted with no problems. They are white light and not the yellow light you get from basic H4's.
I bought a trade pack of them and they worked out around £3 per bulb. I am no expert when it comes to electrics and can't understand why some of them have a cooling fan (which will not fit in the headlight bowl) and the cob type don't.
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I bought some of these bulbs by following the link that trigger posted.... that particular item was sold out but i did manage to find an exact same item for something like £1.98 each iirc. So i bought 3. They were due to arrive in mid sept but actually turned up in about 3 or 4 days, so i fitted them yesterday and they work and look great. I put one in each of the yamaha’s but kept the third as a spare since it wont fit in the Honda as it is still running the original sealed beam type unit and i would need to buy a replacement shell to fit it... prefer to keep her original if i can.. But if and when it ever fails i will definitely go with the leds.. at 6 quid for 3 bulbs its a no-brainer!
JezzaPeach:
Even cheaper! Agreed, I can already see my light reflected off car boots in daytime. Feels safer anyway!
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