Teach you how to correctly choose LED lighting! The application of LED lights is becoming more and more widespread. What should we pay attention to when using LED lighting? For consumers, how can we choose suitable lighting fixtures? This article will introduce them one by one. Power selection: LED bulbs, professionally called LED bulbs, the most common household power is 3W, 5W, 7W, 9W, engineering uses 12W, 18W, 21W, 24W, or even higher power, 40W, 80W, 120W, 150W, etc.
1. Six parameters to roughly judge the quality of LEDs:
1. The unit of luminous flux (Φ) is lumens (lm)
Note: The luminous flux is directly determined by the chip brand, and all our bulbs are provided by the Taiwan chip Guanghong brand.
2. The unit of color temperature (k) is Kelvin
3. Color rendering (ra) color rendering index
4. Light source efficiency (lm∕w)
5. The power factor of the power supply
6. Heat dissipation effect
The lamp that needs to meet these six parameters can basically determine the quality of a lamp!
2. Power selection
LED bulbs are called LED bulbs in professional terms. The most common household power is 3W, 5W, 7W, 9W, and engineering uses 12W, 18W, 21W, 24W, and even higher power, 40W, 80W, 120W , 150W etc.
3W bulbs are generally used in desk lamps and bedside lamps.
5W bulbs are generally used on floor lamps.
7W bulbs are generally used in garages, nanny rooms, etc.
Personal suggestion: like a large chandelier in the living room, usually 3W is mostly used, because it may use 6-30 bulbs on a lamp, and the number of light sources determines its brightness. Like a desk lamp\floor lamp, the suggestion is based on power For larger bulbs, according to Taobao, I understand that many vendors have falsely reported the number of W in terms of power.
Three, lamp holder selection
The lamp holders have bayonet and screw ports. Commonly used lamp holders are E27, E14, E26, etc. These are screw lamp holders. The letter E represents Edison threaded spiral lamp holders or lamp holders, and the number behind represents the outer thread of the lamp holder. The integer value of the diameter, in mm.
Therefore, E27 means a screw base with an outer diameter of 27mm, and E14 means a screw base with an outer diameter of 14mm. The power of the LED light has nothing to do with the size of the base. The LED bulbs of the same power can use either the E27 base or the E14 lamp holder, of which E27 is the most commonly used lamp holder.
There is also a B22 lamp cap. The B22 lamp cap is a kind of lamp cap. The lamp cap refers to the connection at the end of the electric light wire for installing the bulb. It is the part of the lamp that fixes the lamp on the lamp socket and connects the lamp to the power source.
Electric light sources mainly use the naming method of lamp caps and lamp holders. The meaning of related symbols is: B bayonet lamp holder, the number behind B indicates the diameter of the housing, such as: B22D/25×26--refers to a bayonet lamp holder with two contact pieces and a diameter of about 22mm; the total length is about 25mm, The skirt diameter is about 26mm.
Four, parameter summary
In fact, no matter what LED lamp you buy, it is not to look at the appearance, but to look at the heart inside. It is not enough to look at it. The factory needs to use the spectrum analysis system to measure the corresponding test report. There are at least five parameters in the report. Comparing the heat dissipation parameters, it depends on the aluminum shell, and there is no way to see the light decay with the naked eye. They all need to be measured by professional instruments.
Five, price analysis
For example: light bulbs can be divided into: chip, aluminum substrate, housing, power supply, these parts. Each part has different brands, different batches, and different prices. It is equivalent to a free combination. If each part is used well, the price will be very high, otherwise the price will be very low; if some parts are used well and some poorly used, the price will be moderate.
So how should we identify it?
1. If you want the seller to take out the test report, you can see the five parameters at once, and you know it in your heart.
2. It is recommended not to buy products below 6 yuan on Taobao. After all, LED lights have not yet reached the stage of popularization, and the national standards have not yet come out.
3. Looking at the shell, it determines the service life (heat dissipation) of the LED lamp beads; the appearance is the same, and the thickness of the aluminum determines the price.
Six, the choice of color temperature
The color of the light: yellow light: color temperature: 2700-3500K. (to achieve a warm effect, warm color)
White light: color temperature: 6000-6500K. (to achieve a clean and tidy effect, cool colors, now more used in summer)