LED H4 Headlight Bulb | Honda CB350 / CB360 / CB450 / CB500 / CB550
Want the most light a vintage Honda headlight can throw? This LED H4 bulb is it — far brighter than the factory sealed beam, brighter than a halogen H4, and it actually draws less power than the halogen, so it won't tax the old charging system. It is a bulb, though, so it needs an H4 headlight to plug into. If you have already fitted one of our H4 lens or bucket kits — or any bucket that accepts an H4 bulb — this is your brightness upgrade.
Why You Need This
The factory sealed beams on these old Hondas are dim, and the charging systems behind them are anemic — there is not much room to simply throw a brighter bulb at the problem. Most automotive 55W and 60W H4 bulbs make more light but pull more current than these bikes can spare, especially at low RPM.
An LED H4 sidesteps that trade-off. It is the brightest of the three options — LED over halogen over sealed beam — while drawing less power than the 35W halogen it replaces. We spec these bulbs specifically so they light up the road without overloading the stock charging system. The light is a clean, bright white, and the swap is plug-and-play into any H4 socket.
Specifications
| Spec | Detail |
|---|
| Bulb Type | H4 LED, dual low / high beam |
| Power Draw | Lower than the 35W halogen it replaces — safe for the stock charging system |
| Cooling | Fanless — compact driver/inverter box, no spinning fan to fail |
| Light Color | Clean white |
| Fits Headlights | Any H4 lens or bucket (our conversion kits, or any H4-accepting bucket). Does NOT fit an original sealed-beam lens. |
| Fits Models | CB350 / CL350 (1968–1973), SL350 (1969–1973), CB360 (1974–1976), CL360 (1974–1975), CJ360 (1976–1977), CB450 (1965–1974), CL450 (1967–1974), CB500K (1971–1973), CB500T (1975–1976), CB550K (1974–1978), CB550F (1975–1977) — once fitted with an H4 lens or bucket |
| Sold As | Sold individually |
Note: This is the bulb only. It needs an H4 headlight to plug into — one of our H4 lens or bucket conversion kits, or any bucket that accepts an H4 bulb. It will not fit an original Honda sealed-beam lens, which is one sealed unit with no replaceable bulb.
Model-Specific Notes
- 6.25" headlight (CB350 / CL350, CB360 / CL360 / CJ360, CB450 K1–K4 / CL450): Run this bulb in our 6.25" Headlight Bucket & H4 Bulb Kit or 6.25" Headlight Lens & H4 Bulb Kit.
- 7" headlight (CB450 K5–K7, CB500K, CB500T, CB550K / CB550F): Run it in our 7" Headlight Bucket & H4 Bulb Kit or 7" Headlight Lens & H4 Bulb Kit.
- CB450 K0 / CL450 K0 (1965–1967 "Black Bomber"): Uses the same 6.25" headlight front end as the K1–K4. Our listed lens and bucket kits start at K1, but this bulb works in any 6.25" H4 lens or bucket — or any other bucket that accepts an H4 bulb.
- SL350: Fits any H4 lens or bucket. If your scrambler still wears its original sealed beam, you will need to convert to an H4 headlight first.
Installation
Difficulty: Beginner
Tools needed: Work gloves (to keep skin oils off the LED element). No other tools are needed for the bulb swap itself.
- With your headlight already converted to an H4 lens or bucket, open the headlight: remove the trim-ring screws and swing the ring out to reach the back of the lens.
- Unplug the existing H4 bulb and lift it out of the lens.
- Seat the LED H4 bulb into the H4 socket — it pops in the same way a standard H4 bulb does. The LED does not use the rubber dust boot that came with the halogen.
- Tuck the small driver/inverter box inside the bucket, keeping its wires clear of the heat sink. It is compact enough to fit both the factory bucket and our replacement buckets.
- Plug in the connector, test low and high beam, then reinstall the lens and trim ring.
Handle it by the base. The bulb is fanless and cools through a passive heat sink — keep the harness wires away from it, and avoid touching the LED element so skin oils and moisture do not shorten its life.
Our vintage Honda headlight upgrade video walks through the conversion and shows this LED bulb dropping into the H4 lens.
Frequently Asked Questions
Will this fit my stock sealed-beam headlight?
No. The factory headlight is a single sealed-beam unit with no replaceable bulb. To run this LED you first need an H4 headlight — one of our lens or bucket conversion kits, or any bucket that accepts an H4 bulb.
Does it have both a low and high beam?
Yes. Like the H4 halogen it replaces, this is a dual-beam bulb with both a low and a high beam.
Will it overload my charging system?
No — it is easier on the system, not harder. The LED draws less power than the 35W halogen while putting out more light, so it is a safe upgrade for these old Honda charging systems. It is the bright, charge-friendly alternative to the 55W and 60W automotive bulbs that overtax them.
What does the light look like?
Clean, bright white — not the warm yellow of an old sealed beam. Because these reflectors were originally designed around a halogen filament, a few riders notice the low beam leaves a slightly dim patch directly ahead; the high beam fills in fully. For most riders it is a dramatic step up in usable light.
Will it fit a 1980s CB450SC Nighthawk or CB450T Hawk?
Those later twins are outside the vintage range we spec our kits for, and we have not tested them, so we cannot confirm fit. This bulb and our lens and bucket kits cover the 1968–1978 Hondas listed above.
Do I need a separate wiring harness?
No. Our lens and bucket kits include the H4 pigtail connector, and this bulb plugs straight into it.
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Last updated: June 2026
