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. Key Performance Features 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. Technical Specifications of Masuma L640 H4 LED Headlight Bulbs 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 Why Choose the L640 over the L645? 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.
