SOHC.co.uk Forums > CB500/550

H4 headlight

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deltarider:
Ok, here's my take. In my house practically all lights are LED and, although as for ambiance, nothing beats halogen, I'm happy with the results. LED in the workshop is a nightmare. Light is everywhere, reflecting from all parts, making it very difficult to work.
 Now to the bike itself. As far as headlight, I'm always open for innovation, but I prefer to wait for a product by Philips or Osram, that will come as a unit and will be a direct replacement for reflector and bulb combined and then only after I've seen independent tests. Under tests I do NOT count reviews by consumers which are possibly biased by the expenditure they had to do. So far I have not seen LED headlight performances that could convince me. The brightness that some see as a quality, to me is an annoyance and I wonder if I could live with the reflecting light, seen my experience in the workshop.
As for brake- and indicator lights, I really don't see the gain. Energy saved isn't really that much and you'll have to accept the miss of the glow on glow off effect which incandescent bulbs offer. The latter category is also better noticed at an angle. As for longevity, my brake/taillight was replaced only once and two of the four indicator bulbs are still the same the bike had, when it left the assembly line. Not a bad result for 44 years. Conventional bulbs are dead cheap and widely approved. Fitting LEDS for indicators IMO is too much a hassle. You need another relay and diodes. Why people do it? No idea. Maybe they like to tinker.

Rob62:
Some interesting links there trigger and lobo. I will certainly give the led bulbs a try.. The reason i said “they’re expensive” is because i have tried cheap led’s before (although not that type) in the car i used about 6 bulbs in the rear lighting, 3 of them failed within a day so i took them out and wrote the idea off...but at the time i did notice that branded equivalents were much more expensive. I will try the bulbs in triggers link..on the CB and RD250 which is especially poor with a std bulb.. cheers.

Lobo:
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?

sye:

--- 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 ---

You are right of course, the power output does indeed increase with revs, sometimes to 14v. The headlamp filament is a crude affair that glows white hot by the heat created by the current passing through it. The higher the voltage, the brighter the lamp. If the voltage gets too high the lamp will blow. LED is deffinately the way to go.

Trigger:

--- 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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