6000K White Beam for clear night and fog visibility
4000 Lumens Brightness with +150% improved output
H4 Dual Beam (High & Low) design
LED Technology for efficient, stable performance
Plug-and-Play Installation – no modification required
Long Lifetime suitable for daily use
Masuma L640 H4 LED Headlight Bulbs is a reliable, entry-level LED upgrade designed for drivers who want the benefits of LED technology—efficiency and a modern look—without the complexity or noise of a cooling fan. Featuring Seoul CSP chips from Korea, these bulbs are engineered for stable performance in both 12V and 24V systems.
For bhtstore.ug, the L640 is a perfect choice for customers who prioritize long-term reliability and silent operation, particularly for vehicles frequently driven in dusty environments where cooling fans might fail.
Silent Passive Cooling: Built with an aviation-grade aluminum radiator and no moving parts (fanless). This makes the bulb completely silent and significantly more durable in dusty or muddy conditions.
Seoul CSP LED Chips: Equipped with high-quality Korean chips that provide a consistent 4,000 Lumens of light, offering a clear upgrade over standard 1,000LM halogen bulbs.
6000K "Daylight" White: Produces a crisp, cool white beam that improves road sign visibility and gives the vehicle a modern aesthetic.
Dual-Voltage Compatibility: Supports 12V and 24V systems, making it suitable for everything from compact cars (like the Toyota Vitz) to heavy-duty trucks and buses.
IP65 Protection: Dust-tight and resistant to water splashes, ensuring the electronics remain protected even if the headlight housing isn't perfectly sealed.
Integrated Current Stabilizer: Built-in circuitry prevents flickering and protects the LEDs from voltage spikes, ensuring a lifespan of up to 30,000 hours.
| Feature | Details |
| Model Number | L640 (S1 Series) |
| Bulb Fitment | H4 / P43T (Dual Beam) |
| Light Source | SEOUL CSP Chips (Korea) |
| Luminous Flux | 4,000LM per Set |
| Color Temperature | 6000K Cold White |
| Wattage | 18W per Bulb |
| Voltage Range | DC 12V – 24V |
| Cooling Type | Passive (Aluminum Radiator) |
| Material | Aviation Aluminum |
| Lifespan | Up to 30,000 Hours |
While the L645 model offers higher brightness (up to 5,000LM) and active fan cooling, the L640 is often preferred for:
Reliability: No fan means no mechanical parts to fail over time.
Space: The passive radiator is often more compact in depth, fitting better in tight headlight housings.
Silence: Ideal for electric vehicles or drivers who are sensitive to the faint hum of LED cooling fans.
