SOHC.co.uk Forums > CB500/550
H4 headlight
McCabe-Thiele (Ted):
--- Quote from: sye on September 01, 2020, 10:31:50 AM ---There are LED H4 lamps currently seeking approval. They have come a long way and are undoubtedly what everyone will be using in a few short years. The bulb below mimics a halogen H4 perfectly and has an ideal beam pattern. It's also the same size as a standard H4 and fits in any headlight shell.
The downside is that they currently cost around £30 each but that will drop to around a fiver in the next few years.
--- End quote ---
You are right the price will drop probably quite quickly as its a pretty big market world wide .Not sure how they can get the heat sink to be so small with a decent lifespan - not seen that shape before who is selling them - have you a link?
Erny:
just found it here https://www.autobulbsdirect.co.uk/twenty20-led-headlight-bulbs-H4-pair.html
they stay rated ~20W (what is good), colour temp ~6000K (not so good, this is reason to be stopped by police...).
Curious to know plans for approvals
K2-K6:
They appear (from their pictures on link) to be using two array at different angle to mimic the radial dispersal of a tungsten filament. With geometric placement that also looks to replicate tungsten, it seems to offer a potentially accurate reproduction. After all, various parts of tungsten filaments are often shielded to prevent light scatter in unwanted directions.
It seems reasonable to approach it from the opposite direction from a technical perspective, ie. tungsten with high radial dispersal "barn door" shuttered to control light direction with attendant losses, versus led arrangements in a "spread" array to arrive at something very close.
McCabe-Thiele (Ted):
--- Quote from: Erny on September 01, 2020, 08:47:28 PM ---just found it here https://www.autobulbsdirect.co.uk/twenty20-led-headlight-bulbs-H4-pair.html
they stay rated ~20W (what is good), colour temp ~6000K (not so good, this is reason to be stopped by police...).
Curious to know plans for approvals
--- End quote ---
Thanks Erny I have saved that site for future reference.
Zoltan:
Soon after buying my 550F2 in 1977, I discovered Paddy Hopkirk had a shop/warehouse somewhere out near Leighton Buzzard/Wing area (I can't remember) and sold a Cibie Z Beam conversion. This used a headlamp bezel from a Mini to enable it to fit the headlamp bowl on the 550F2. It was a transformation. It's still on the bike, still works just fine.
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