How bright is a 20W LED light?
3 Answers
20W LED high-brightness lamps are 45% brighter than ordinary 20W energy-saving lamps. A 20W LED light has an illuminance of 1680. This can be understood as the luminous flux ф of this lamp on a 1m2 area being 1680lm, while the luminous flux of an ordinary 40W straight-tube fluorescent lamp is 2400lm. The advantages of LED lights are as follows: Good durability: LED components have a simple structure, excellent impact resistance, and shock resistance, are not easily broken, and can adapt well to various environments. Energy-saving and low cost: In cars, for the same daytime running lights, the energy consumption of LED components is only 1/20 of that of halogen lamps. The cost of LED components has also decreased significantly year by year, and currently, the cost and price are still decreasing by more than 20% annually.
I love studying car lights when driving. A 20-watt LED light with over 2000 lumens is considered quite powerful in automotive lighting. At night, this kind of light can clearly illuminate the road 30 meters ahead, which is about three times brighter than ordinary halogen lights. However, be cautious about overheating issues from modifications. A friend of mine once installed a cheap no-brand light, and the housing got deformed during a long-distance drive. It's recommended to choose models with aluminum alloy heat sinks, and opt for Cree or Philips LED chips—though more expensive, they're more reliable. When installing, don’t just focus on brightness; remember to adjust the beam angle properly, or you’ll blind oncoming drivers.
20W LED? Brightness ranges approximately between 1800-2200 lumens. The actual perception is like turning on 10 high-power flashlights simultaneously, providing adequate road illumination for nighttime driving. However, the key lies in heat dissipation and drive circuitry: metal substrate cooling efficiency must exceed 85%, as overheating of constant-current driver ICs may cause flickering. Some modification cases have experienced over 30% lumen depreciation within six months due to inadequate heat dissipation. The original equipment's light focusing design is also crucial - aftermarket assemblies using identical LED chips may exhibit 20-meter differences in actual projection distance. Having tested a popular product claiming 2000 lumens that measured only 1600, I advise against relying solely on specifications when purchasing.
