[Product Selection Guide] How buy LED Downlight
Due to its beautiful appearance and easy installation, the downlight can increase the soft atmosphere of the space and create a warm and romantic feeling, which is very popular in home decoration and commercial lighting. With the gradual maturity of LED lighting technology, there are LED downlights with different shapes on the market. How to choose?
First, LED downlight standard
The current LED downlight related standards are as follows:
GB 7000.201-2008 Luminaires Part 2-1: Special requirements Fixed general purpose luminaires
2.GB7000.202-2008 Luminaires Part 2-2: Special requirements Recessed lamps
3.GB/T29294-2012 LED Downlight Performance Requirements
Among the above three standards, GB7000.201 and GB7000.202 are mandatory standards, which stipulate the most basic electrical and mechanical safety requirements for downlights; GB/T 29294 specifies the specifications of LED downlights and their performance requirements such as light quality and luminous efficiency. .
Second, the classification of LED downlights
1. According to the installation method
From the perspective of installation, downlights can be classified as either fixed or flush mounted. Fixed installation means that the downlight is fixedly installed on the surface of materials such as ceilings, which are so-called surface mount downlights; embedded installation means that the downlight is embedded into the ceiling. Due to the height of the indoor space, most downlights are embedded. The applicable safety standard for fixed downlights is GB7000.201-2008, and the applicable safety standard for embedded downlights is GB7000.202-2008.
2. Divided by size
Downlights can be categorized into 2-inch, 2.5-inch, 3-inch, 3.5-inch, 4-inch, 5-inch, 6-inch, 7-inch, and 8-inch. Households are usually 2-inch, 2.5-inch and 3-inch. Offices, shopping malls and other general use 4 inch-8 inch downlights.
Third, choose the key indicators
1. Lamp efficiency
Mainly reflect the energy saving characteristics of the downlight, the unit is lm/W, the higher the value, the better the energy saving effect. GB/T29294 requirements at least in the 35lm / W or more, at present many products can reach 70lm / W, a good product can reach 90lm / W or more.
2. Color rendering index
Evaluate the color development ability of a downlight on an object, with a value of 0-100. The larger the value, the closer the response of the downlight to the color of the object is to the true color. The general requirement is above 80 and above 90 indicates that the color rendering is very good.
At present, the national standard does not require the service life of LED downlights. The product that passes the energy saving certification requires 30,000 hours, that is, if the downlight works for 8 hours a day, it can work for nearly 10 years.
Fourth, buy product considerations
1. See if there are 3C signs
Downlights are included in the national mandatory product certification list, must pass 3C certification and posted 3C signs in order to leave the factory. Only products that are affixed with the 3C mark can indicate that the product meets the electrical and mechanical safety requirements, that is, meet the requirements of the national standard GB7000.201 or GB7000.202 and can be used safely. The way of attaching the 3C logo is generally printed or molded.
2. Look at the nameplate mark and appearance packaging
National laws and national standards require that LED downlights be marked with the following: rated power, applicable ambient temperature, mounting surface materials, and source marking. Generally, the trademark quality of high-quality products is of good quality, the logos are legible, and there are address, contact information, after-sales information and related certification marks of the manufacturer.
3. See the applicable environmental conditions
According to the information marked on the LED downlight, the applicable environmental conditions can be distinguished.
(1) Mounting surface materials for downlights
Some surface mounted downlights or recessed downlights are only suitable for installation on the surface of non-combustible materials, ie only on surfaces made of metal, mortar or concrete, and not surfaces made of wood.
For the downlights to be embedded in the ceiling, it is also necessary to see if there are signs “not covered by insulation material”, and “Under any circumstances, the luminaires cannot be covered with thermal insulation or similar materials.” Similar warnings . Special attention should be paid to the insulation on the ceiling. For example, some huts use insulation or insulation between boards for insulation purposes, and some malls, supermarkets, etc. also use insulation to silence sound. If there is a downlight installed in these huts, they cannot be selected as “not suitable. The downlight of the sign covered by the insulation material.
(2) Applicable ambient temperature
Products that pass the 3C certification will be given the applicable ambient temperature on the label, generally denoted by ta. If this mark is not on the mark, the default is for an ambient temperature of 25°C.
4. Look at the color temperature
At present, the product mainly has two colors, one is a warm color, that is, yellow light; the other is a cool color, that is, a white light. Warm colors give people a warm feeling and apply to hotels, hotels and bedrooms; cool colors give people a cool feeling and are used for lighting in offices and living rooms.
5. See if the emitted light is even and soft
The use of transparent glass cover or LED cover without a glass cover, the light will be directly revealed, if you look up will be more dazzling; using matte material light cover, the light will be more uniform and soft, will be more comfortable, but will reduce the entire lamp Luminous efficiency.
6. Look at performance indicators
The main focus is on the three indicators of light efficiency, color rendering index and lifespan. Enterprises generally give the above values on the product or in the specification. The current light efficacy level is 70 lm/W. Some companies do not directly mark the value, but indicate the power and luminous flux. We use the luminous flux/ The value obtained by the power is roughly the light efficiency level of the product; the color rendering index is required to be above 80; and the life expectancy reaches more than 30,000 hours.
7. The material of the panel
Iron, die-cast aluminum, aluminum, and stainless steel are commonly used. Iron sheet is cheap, but it is not used for a long time; it is recommended to use die-casting aluminum, aluminum or stainless steel, and the price is relatively high.
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