LIU HJG H-C318 7-Inch Diamond LED Projector Headlight – 58W High / 50W Low + DRL | Royal Enfield, Triumph & Custom Bikes

LIU HJG H-C318 7-Inch Diamond LED Projector Headlight

No Warranty 

LIU HJG H-C318 is a premium 7-inch round LED projector headlight built for riders who want substantially stronger road illumination than a weak stock halogen / basic LED setup while retaining a clean round-headlight appearance.

The H-C318 is commonly marketed as the “C318 Diamond” projector headlight. The model chart on the current LIU HJG packaging lists 58W high beam and 50W low beam. Current public HJG sellers also list the C318 as a 7-inch projector-style headlight for Royal Enfield, Triumph and other compatible 7-inch housings.

Why the H-C318 Is Different from the LIU HJG Alpha

Under The Hood also sells the LIU HJG Alpha / C325-style headlight. H-C318 is a different model. The C318 uses its own projector / DRL design and is listed at 58W high beam / 50W low beam, while the Alpha/C325 family is marketed with a different optical design and higher quoted beam wattages.

If you specifically want the C318 Diamond-style face, order H-C318 rather than selecting an Alpha only because both are 7-inch round HJG headlights.

Key Product Specifications

About the “108W C318” Search Term

Several sellers advertise this model as a 108W C318 by adding the listed 58W high-beam figure and 50W low-beam figure. For buyer clarity, this listing keeps the actual individual beam figures visible: 58W high / 50W low.

Do not interpret “108W” as proof that both beam circuits continuously draw their full rated wattage simultaneously in every wiring configuration.

DRL / Smart-Control Feature

The H-C318 has an integrated DRL. A recent H-C318 owner installation also reports that the DRL can be selected to an orange / amber colour.

Bluetooth / app-control note: Current Under The Hood stock has been supplied / represented with Bluetooth-connected smart-light functionality, but indexed public C318 product pages do not consistently document the exact app, control modes or Bluetooth specification. Because HJG batches can change, confirm the QR/app instructions supplied with the actual unit before relying on a particular mobile-app feature. We deliberately do not invent an app name, Bluetooth version or unsupported RGB mode list.

Real-World H-C318 Owner Feedback

A recent Triumph Scrambler 400X owner who installed the exact LIU HJG H-C318 posted high-beam, low-beam, DRL and night-riding examples and described the light as a major improvement over the stock headlight. The same owner reported paying approximately ₹4,800 for the headlight itself, with the retaining ring, coupler and installation charged separately.

The owner also noted that the correct coupler / adapter was required because the bike connector did not directly match the headlight. This is why Under The Hood does not advertise the C318 as universally plug-and-play merely because it is 7 inches.

Common Vehicle Categories

The H-C318 is sold in the market for compatible 7-inch round-headlight applications including:

• Royal Enfield – Classic, Bullet, Meteor, Interceptor, Continental GT and other compatible round-headlight builds
• Triumph – Speed 400 / Scrambler 400X style conversions where the correct ring / coupler is used
• Honda CB350 / H'ness – sold by some retailers as part of vehicle-specific full kits
• Royal Enfield Himalayan 450 / Guerrilla 450 – sold in the market with vehicle-specific mounting / coupler kits
• Mahindra Thar / Jeep / Gypsy / custom 7-inch conversions where physical and electrical fitment is separately verified

These model names are common market applications, not a universal direct-fit guarantee. The same H-C318 lamp can require different rings, brackets or couplers on different vehicles.

Popular Royal Enfield Buyer Checks

Triumph Speed 400 / Scrambler 400X Fitment

The H-C318 has real-world installation evidence on the Triumph Scrambler 400X. However, the reported installation used a separate ring and connector coupler. Therefore the headlight itself should not be sold as a guaranteed direct plug-in Triumph replacement.

Before ordering for Speed 400 / Scrambler 400X, confirm the headlight ring, connector pinout, rear depth and whether an adapter harness is required.

Headlight Only vs Full Kit – Read Before Ordering

Some online C318 listings are sold as a “full kit” that can include:

• H-C318 headlight
• Vehicle-specific retaining ring
• Coupler / adapter
• Nut-bolt / lock hardware

This Under The Hood product listing is for the headlight assembly unless the selected offer specifically states otherwise. Do not assume a ring or coupler is included from another seller's product photos.

Why Beam Pattern Matters More Than a Big Wattage Number

A strong headlight is useful only when its beam is aimed correctly. A poorly aimed high-output projector can cause glare to oncoming traffic and can actually reduce the rider's useful road visibility.

• Low beam should illuminate the road without being aimed into oncoming drivers' eyes.
• High beam should be used only when traffic and road conditions permit.
• Re-aim the headlight after changing the ring, bracket, front suspension height or tyre setup.
• Check beam alignment after installation at night against a wall before highway use.

12-Month Warranty Marking on Current Packaging

The current LIU HJG box supplied to Under The Hood clearly carries a “12 Months Warranty” marking. Some other Indian C318 sellers currently advertise only 6 months.

Important: the printed manufacturer / distributor marking should not be interpreted as an unconditional Under The Hood replacement promise. Warranty eligibility, exclusions, proof of purchase, installation condition and claim handling are subject to the applicable warranty terms for the stock supplied.

Packaging Performance Claims

The current LIU HJG retail box prints the following manufacturer marketing claims:

• Energy Saving: 70%
• Improved Brightness: 50%
• Service Life: up to 30,000 hours

These are manufacturer packaging claims and are not independent Under The Hood laboratory test results.

Installation Guidance

• Verify physical 7-inch fit before connecting the lamp.
• Confirm bucket / ring depth and rear housing clearance.
• Identify high beam, low beam, ground and DRL circuits before applying power.
• Use a proper vehicle-specific adapter rather than cutting the original loom wherever possible.
• Do not force an incompatible coupler.
• Seal additional DRL / smart-control wiring against water.
• Ensure steering movement does not pull or crush the wiring.
• Secure the headlight firmly to avoid vibration / horizontal play.
• Aim the beam after installation.
• Professional installation by a motorcycle electrician is recommended.

What You Will Receive

1 × LIU HJG H-C318 / C318 7-Inch LED Projector Headlight Assembly

Vehicle-specific headlight ring, bucket, coupler, adapter harness, mounting kit, nut-bolt lock, switches and installation service are not included unless specifically stated in the selected product offer.

Buyer FAQs

Is this the HJG C318 or Alpha C325?
This is the H-C318 / C318. It is a separate model from the LIU HJG Alpha / C325.

What is the wattage?
The current C318 model chart shows 50W low beam and 58W high beam.

Why do some sellers call it 108W?
They add the 50W and 58W beam figures. We show the two beam ratings separately to avoid implying that both circuits always operate at full rated load simultaneously.

Is it 7 inch?
Yes. Current C318 retail listings identify it as a 7-inch round headlight.

Does it have a DRL?
Yes. H-C318 owner reports and current product information show a DRL function.

Can the DRL turn amber / orange?
A current H-C318 owner reports selectable orange DRL operation. Exact control method can vary by batch / wiring.

Does H-C318 have Bluetooth?
Current Under The Hood stock has been represented with smart / Bluetooth-connected functionality. Because current indexed C318 pages do not consistently publish the exact app or Bluetooth specification, verify the QR / app instructions supplied with your actual unit before relying on a particular app feature.

Does it fit Royal Enfield Classic 350?
It belongs to the 7-inch round headlight category and is commonly adapted to Royal Enfield applications, but direct fit depends on your Classic generation, retaining ring, bucket depth and coupler.

Does it fit Meteor 350?
C318 is sold for compatible Meteor applications, but confirm the ring, connector and rear clearance before ordering.

Does it fit Interceptor 650 / GT 650?
It can be used in compatible 7-inch conversions. Verify the retaining ring and electrical connector before purchase.

Does it fit Triumph Scrambler 400X?
There is real-world H-C318 installation evidence on Scrambler 400X, but the owner required a separate retaining ring and coupler. It is not universally plug-and-play.

Does it fit Himalayan 450 / Guerrilla 450?
Indian sellers offer H-C318 full kits for these models with additional ring / coupler hardware. If buying the headlight alone, confirm the required conversion parts separately.

Does it fit Honda H'ness / CB350?
Indian sellers also offer model-specific C318 full kits for CB350 / H'ness. The bare headlight still requires the correct ring / coupler arrangement.

Is a relay required?
A recent Scrambler 400X H-C318 installation was reported without a separate relay, but that does not establish a universal wiring requirement. Use the correct electrical setup for your vehicle.

Is it plug-and-play?
Only when the vehicle's headlight ring and electrical connector match. Many installations require a separate coupler / adapter.

Is the headlight ring included?
Not unless specifically stated in the selected offer.

Is the coupler included?
Not unless specifically stated. Some vehicle conversions require a separate adapter coupler.

Is there a 12-month warranty?
The current LIU HJG box is printed with a 12-month warranty marking. Actual warranty service is subject to the applicable manufacturer / seller terms and exclusions.

Can I use it on Mahindra Thar / Jeep / Gypsy?
C318 is sold in the market for compatible 7-inch four-wheeler housings as well, but mounting, wiring and road-legal requirements must be checked separately.

SEO / Buyer Search Terms

LIU HJG H-C318, HJG C318 headlight, H C318 headlight, C318 Diamond headlight, HJG Diamond projector headlight, HJG 108W headlight, HJG 58W 50W headlight, 7 inch projector headlight, 7 inch LED motorcycle headlight, Bluetooth headlight bike, smart headlight motorcycle, app control HJG headlight, Royal Enfield C318 headlight, Classic 350 HJG headlight, Bullet 350 HJG headlight, Meteor 350 HJG headlight, Interceptor 650 C318 headlight, GT650 C318 headlight, Triumph Speed 400 HJG headlight, Scrambler 400X C318 headlight, Himalayan 450 HJG headlight, Guerrilla 450 HJG headlight, CB350 HJG C318 headlight, Hness C318 headlight, HJG headlight with DRL, aftermarket 7 inch LED headlight