SOHC.co.uk Forums > CB500/550

H4 headlight

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JezzaPeach:
sye’s formula, which I forgot due to daydreaming of Hondas in my school physics lessons, maybe helps answer other posts on condenser etc problems with a weak battery combined with poor coils/plugs/caps.

deltarider:

--- Quote from: sye on August 13, 2020, 08:29:30 AM ---55 + 60 = 115W. 115W @ 12v = 9.5A. 115w @ 14v = 8.2A.

--- End quote ---
I know. I hinted at that myself in reply #17, but how is it, the fuse didn't blow, giving all the other oh, so demanding consumers, many are happy to sum up, whenever they feel the urge to buy just another  thingie? In other words: I don't see Jeremy's problem.

JezzaPeach:
Yes mine isn’t a problem, just concerned reading it in the other post. So maybe when it’s a problem for someone it’s due to other bad connections or parts.

Lobo:
Some interesting points raised, and before I go on I’ll declare I’m no official sparky...

(1) Reliability of Chinese products. Agreed, but 2 issues, the first of which Bryan promptly answered, and secondly, when put into perspective of a conventional bulb... well, I’d reckon the Chinese LED would win through.
Point of manufacture aside, these LEDs appear to have a very broad voltage range (10-30v DC) which further assists in making ‘em bullet proof in respect of 50yo agricultural voltage regulators!

(2) my tabulation of post #5 is indeed simple, I declared it ball park and was aimed at giving a basic feel of it all. I don’t however agree with the amps decreasing in relation to the voltage increasing...if this were the case the lumens would remain constant as you revved the bike from idle to 5000rpm. They don’t; we all know the headlamp brightens with increased voltage through experience...
(the resistance of a light bulb is fixed, so if you increase the Voltage, then using Ohms law I=V/R then the current (I) must increase too. Yea, I know.... ZZZzzzzz)

(3) Appreciate the point about beam pattern. However, the quality manufacturers seem to be at pains pointing out their products mimic the make up dimensions of the equivalent Halogen... and given stringent Western automotive standards you’d kinda think they’d be keen to get it right? (I honestly don’t know, but am happy to take a punt here)

(4) your own bike deltarider / 40yrs etc, there are differing circuit options / specs across the bikes and I wouldn’t know what yours is. Assuming though a UK spec the  numbers are not outside of the fuse rating. (unless adding in indicators, brake lights etc when your fuse might be working hard and managing to keep its head above water when additional loads are temporarily On.

(5) your ‘dual’ dipped + full beam; yep I’m surprised you got away without blowing a fuse, though if NO other loads on (brake light etc) you might just get away with it.
Oh hang on... you did!

Horses for courses etc, personally it seems to me that (1) battery charging is being overlooked, and (2) a more elegant fix is available than the Jeremy Clarkson approach of.. “MORE POWER!!!” 😂

sye:
Amperage drops as voltage increases.
120w @ 12v = 10.0a
120w @ 120v = 1.0a
120w @ 240v = 0.5a

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