First, the six parameters of the quality of the LEDs are generally judged:
1, the light flux (φ) unit is a lumen (LM)
Note: The light volume is directly decided by the chip brand, and our light bulb is all provided by Taiwan chip Guanghong brand.
2, color temperature (k) unit is Kaewe
3, color color (RA) color color index
4, light source efficiency (lm / w)
5, power factor for power supply
6, heat dissipation effect
It is necessary to meet the six parameters of the lamp, it is basically a good decision!
Second, the power selection
LED bulbs, professional highly called LED bulb lamps, the most common household power is 3W, 5W, 7W, 9W, engineering 12W, 18W, 21W, 24W, even greater power, 40W, 80W, 120W 150W, etc.
3W bulbs are usually used on the table lamp, the bedside lamp.
5W light bulbs are usually used on the floor lamp.
7W light bulbs are typically garage, hot hair, etc.
Personally surprise: like a large chandelier in the living room, usually 3W, because it might use 6-30 bulbs on a light, the number of light sources determines his brightness. Look like a lamp floor lamp, surprisingly selected power Big light bulb, according to the Taobao, many vendors have the existence of false reports W number in power.
Third, the lamp is selected
The lamp holder has a bayonet and screw, and the commonly used lamps have E27, E14, E26, etc., these are screw sockets, the letter E represents the spiral lamp or lamp holder of the love Di Si-thread, the number behind the lamp stands outside the lamp holder The integer value of the diameter is mm.
Therefore, E27 represents a screw socket having a size of 27 mm. E14 indicates a screw socket having an outer diameter of 14 mm. The power of the LED lamp and the size of the lamp are not related. The same power LED bulb can either E27’s lamp head or The E14 of the lamp, where E27 is the most commonly used base.
There is also a B22 lamp head. The B22 lamp head is one of the lamp, the lamp head is the end of the light line, which is used to secure the lamp to the lamp holder, so that the lamp is connected to the power supply.
The electrical light source mainly uses the lamp head, the lamp holder naming method. The correlation symbols mean: B card mouth base, the number behind the b represents the diameter of the outer casing, such as: B22D / 25 × 26 – refers to a bayoner with two contacts and a diameter of about 22mm; the total length is about 25mm, The skirt is about 26mm in diameter.
Fourth, the parameter summary
In fact, no matter what light you buy, it is not looking at the appearance, but looks at the heart, the light is still not working, it is necessary to measure the corresponding test report by the factory spectrum analysis system, and at least five parameters on the report we can go Comparison, heat dissipation parameters, this is to see aluminum shell housing, and there is no way to look at the naked eye, and professional instruments are required.
V. Price analysis
For example: the bulb can be divided into: chip, aluminum substrate, housing, power supply, these large parts. Each section has different brands, different batches, and different prices. Equivalent to a free combination. Every part is good, then the price is very high, and the price is very low; there is also a part of it, and the part is poor, the price is moderate.
So how should we identify it?
1. Let the seller take this test report, and you can see five parameters, and there is a number in roughly.
2. It is recommended not to buy products below 6 yuan. After all, the LED lamp has not yet went to the popularity of the popularity, and the national standards have not yet come out.
3, look at the casing, it determines the life of the LED lamp (heat dissipation); look at the same, the thickness of the aluminum determines the price.
Six, color temperature selection
Seat color: Huangguang: Color temperature: 2700-3500K. (To achieve warm effect, warm color)
White light: color temperature: 6000-6500K. (To achieve clean and tidy effect, cold tone, now more in summer)
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