What is the difference between the calculation of the price of LED street lamps at home and abroad?

What is lumens?

Lumens are the units of luminous flux. The luminous flux is the intensity of light that arrives, leaves, or passes through a curved surface per unit of time. It also refers to the ratio of light emitted by a light bulb. To know how much luminous flux a luminaire is, it is a more professional and complicated problem. It needs to be tested with an integrating sphere, as shown in the figure:

Conversion of tiles and lumens

In general, in the case of considering only the most sensitive 555 nm yellow-green light of the human eye, 1 watt of optical radiation power produces 683 lm (lumen) of luminous flux, ie 1 watt = 683 lumens. So 1w incandescent lamp has 683 lumens? No, incandescent lamps can reach 1W=20 Lm is very good, and the rest are light (infrared) that is invisible to the heat or the human eye.

Calculating the price of LED street lamps with lumens is more scientific

lumen (lm) International system of units (SI) And the US unit system (AS) The luminous flux unit has long used lumens as a calculation unit in foreign developed countries to calculate the price of LED street lamps. For example, the price of LED street lamps with 80lm is not high for 100lm LED street lamps. Domestically, China still calculates the price of LED street lamps with wattage. The 100W LED street light is obviously lower than the price of 150W. But obviously, this wattage algorithm is unfair, because the street lamp conversion rate produced by each LED street lamp manufacturer is different. Some manufacturers produce 150W LED street lamp lumens may only be 8000lm, while some manufacturers produce 150W street lamp lumens may reach 12000lm or more. The market price of 150W LED street lights is almost the same, the bigger the lumen, the brighter the lamps. Of course, unwitting customers will not find this, and even some customers will ask why the same wattage of LED street lights, the price of A home is much lower than yours? This is because some manufacturers use 100W LED street lights to sell as 150W, the price is of course much lower, but the light effect is obviously not in a grade.

Example: wattage and lumen conversion of LED street lights

LED street light 180 watts = 18000 lumens

Light efficiency per 100 watts > 100 lumens

to sum up

It is recommended that you buy LED street lights (other lamps) to better understand its lumens, not wattage, so the calculation of LED street lights is more scientific!

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