What is the meaning of lumens of LED strip?

Lumen is the abbreviation of Ansi Lumen, or Lumens, abbreviated lm. luminous flux light source in the unit of time, radiation to the surrounding space to make the human eye feel the energy, called luminous flux. Expressed by the symbol φ, the practical unit is lumen, or stream for short. Unit of electrical power issued by the number of lumens, known as luminous efficiency.

1. lumens is a physical unit to describe the luminous flux, physics explained as a candle (Candela Candela, luminous intensity units, equivalent to the luminous intensity of an ordinary candle) in a three-dimensional angle (radius of 1 m on the unit sphere, 1 square meter of the sphere crowned by the angle represented by the cone, which corresponds to the angle of the center of the circle in the cross-section of about 65 °) on the total amount of luminous flux generated by the emission. led lamp lumens is the unit of led light flux.

2. lumens is not the exclusive concept of led strip lights. For decades lumens has been used as a measurement rating for light bulb luminous flux, and only recently has it been labeled in product packaging. 2011 the U.S. Federal Trade Commission required manufacturers of CFL, incandescent and led bulbs to use lumens to label the brightness of the bulb. led strip lumens specify that the higher the value, the brighter the bulb.

Led lamps use less energy and therefore have a lower wattage specification, which makes measuring led bulb brightness by wattage meaningless. To solve this problem, light bulb manufacturers have begun to use lumen ratings to more accurately indicate the brightness of the bulb.

Led strip lumens are: SMD3528, IF = 20mA, lumen value of about 7lm; SMD5050, IF = 60mA, lumen value of 18-22lm, currently 18-22LM mostly, the high also reached 24-26LM.

Simply put, the lumen value of the LED strip can represent his brightness, the higher the brightness the higher the lumen value, rather than power W to determine. The lumen value of LED strip light is tested by integrating sphere testing instrument.

What is the meaning of single bead lumen of led?

LED lamp life is very long, the lamp bead chip life can be very long, but the driver original life is not long, the driver are bad, LED chip is certainly not bright. LED color rendering than the three-color fluorescent lamp is much lower, LED Ra generally about 80, three-color fluorescent lamps generally about 90, there are high-end Ra 95 products, the price is not expensive.