Which is brighter between LED headlights H4 and H7?
2 Answers
LED headlight H4 is brighter because H4 is a dual-beam bulb combining high and low beams, while H7 is a low-beam bulb. Xenon lights are categorized into eight types based on bulb forms: High beam with lens, low beam with lens, h1 (high-beam bulb), h3 and h11 (fog lights), h4 (dual-beam bulb), h7 (low-beam bulb), 9005 and 9006. Car headlights, also known as front headlamps, are lighting fixtures installed symmetrically on both sides of the front end of a vehicle to illuminate the road ahead during nighttime driving. LED is an electroluminescent device that uses a solid-state semiconductor chip as the light-emitting material, emitting light directly through photon emission caused by carrier recombination. LED headlights are lighting devices manufactured using LEDs as the light source.
I usually enjoy researching various car modification parts and have replaced many LED bulbs. I've found that the brightness difference between H4 and H7 doesn't lie in the model itself. It mainly depends on the specific product's LED chips and heat dissipation design. For example, H4 and H7 bulbs with the same 8000 lumens have almost identical actual lighting effects. However, since H7 has a single-filament structure, it's easier to achieve better heat dissipation, and high-end models from the same brand often squeeze out about 10% more brightness. But now mainstream brands like Philips and Osram have optimized the heat dissipation fins for their H4 bulbs - choosing the right model provides fully sufficient brightness. The key is still to look at the actual lumen value marked on the product. From my own installation and testing, the difference is really minimal.
