LED bulb parameter analysis and selection guide

1. Luminous flux ( ¢ ) unit is lumens (lm)

Note: The luminous flux is directly determined by the chip brand, and all of our bulbs are provided by Taiwanese chip Guanghong brand.

2. The color temperature (k) unit is Kelvin.

3, color rendering (ra) color rendering index

4, light source efficiency (lm∕w)

5, the power factor of the power supply

6, cooling effect

Need to meet the lights of these six parameters, basically can determine the quality of a lamp!

Second, power selection

LED bulb , professionally known as LED bulb , its most common household power is 3W, 5W, 7W, 9W, 12W, 18W, 21W, 24W, even larger power, 40W, 80W, 120W , 150W, etc.

3W bulbs are generally used on table lamps and bedside lamps.

5W bulbs are generally used on floor lamps.

7W bulbs are generally garages, babysitters, etc.

Personal idea: like the big chandelier in the living room, generally use 3W, because it may use 6-30 bulbs on one lamp, the number of light sources determines his brightness. Like the desk lamp\floor lamp, the power of the selection A bigger light bulb, according to Taobao, which I know, many sellers have falsely reported the existence of W number in power.

Third, the lamp head selection

The lamp holder has a bayonet and a screw. The commonly used lamp holders are E27, E14, E26, etc. These are all screw sockets. The letter E indicates the Edison screw or the lamp holder. The numbers on the back represent the socket. The integer value of the diameter, the unit is mm, so E27 represents the screw head with an outer diameter of 27mm, and E14 represents the screw cap with an outer diameter of 14mm. The power of the LED lamp has nothing to do with the size of the lamp, and the same power LED bulb E27 heads can be used, or E14 heads can be used, of which E27 is the most commonly used head. There is also a B22 base. The B22 base is a type of base. The base refers to the interface that is connected to the end of the lamp line for mounting the lamp. It is the part of the lamp that fixes the lamp to the lamp holder and connects the lamp to the power supply. The electric light source mainly uses the lamp head and the lamp holder naming method. The relevant symbols mean: B bayonet lamp head, the number behind B indicates the diameter of the casing, such as: B22D/25×26-- refers to the bayonet cap with two contacts and a diameter of about 22mm; the total length is about 25mm, The skirt has a diameter of approximately 26 mm.
Fourth, the parameter summary: In fact, no matter what LED you buy LED, in fact, not look at the appearance, but look at the heart inside, light is not enough, you need the factory to use the spectral analysis system to measure the corresponding test report, the report has at least five We can compare the parameters, the heat dissipation parameters, it depends on the aluminum shell, the light fade can not be seen with the naked eye, all need professional equipment to measure.

V. Price analysis:

For example: bulbs can be divided into: chips, aluminum substrates , housings, power supplies, these parts. Each part has a different brand, different batches, and different prices. Equivalent to a free combination. Every part is used well, then the price is very high, otherwise the price is very low; some parts are used well, some are used badly, the price is moderate.

So how should we identify it?

1. Let the seller take out the test report and see five parameters at once.

2, on Taobao, it is recommended not to buy products below 6 yuan, after all, LED lights have not yet reached the stage of popularization, the national standards have not yet come out.

3, look at the shell, it determines the life of the LED lamp beads (heat dissipation); the appearance is the same, the thickness of the aluminum determines the price.

Sixth, the choice of color temperature

1, the color of the light: yellow: color temperature: 2700-3500K. (to achieve a warm effect, warm colors)

White light: Color temperature: 6000-6500K. (Achieve clean and tidy effect, cool color, now used more in summer)