Linsheng Electromechanical Co , Ltd , Led Lamp Purchase Advice
LED lamp applications are becoming more and more popular. Linsheng Electrical Co , Ltd. shares the optional elements of LED lights, and hopes to have a reference for everyone.
First, the luminous flux
This is the first important parameter for all luminaires. The standard definition is “the derived amount of radiant flux for the evaluation of standard human visual characteristics by international regulations”. For luminaires, this parameter is “the sum of the visible light emitted by the luminaire per unit time.” Unit: Lumen, symbol lm.
Shopping advice: For the same type of lamp, this parameter must exceed the minimum limit (pit), as high as possible. The parameter that really determines the quality of illumination is the illuminance – “the luminous flux of visible light received per unit area”. From this parameter, the limitation of the anti-pushing flux is limited. It is complicated and needs to consider the type of lamp, the light distribution curve, the installation environment, the height, etc. This pit is not filled. This important parameter is generally marked in an unimportant position. Some small factories simply do not mark it, so remember his unit symbol “LM”, otherwise you will not recognize this parameter.
Second, the power
This parameter lamp consumes electricity every hour. Everyone knows that the smaller the better, the more. Shopping advice: In the case that the luminous flux meets the demand, the smaller the power, the better. This parameter is generally eye-catching, and sales also use him to distinguish the “brightness” of the luminaire. This parameter is second only to the luminous flux.
Third, the color temperature
The color temperature values under natural light are used as a comparison. Sunrise: 1900K. Midday sunshine: 5500K. The daylight is clear at 6500K. Incandescent lamp: 3000K purchase opinion: The color temperature of general LED lamps is better between 4000K and 5000K. In places where the bedroom needs to have mood and comfort, choose 2700K-3000K. High color temperature LED lights (above 5700K) look whiter, giving the illusion of “higher color and brighter”. The high color temperature LED lamp has a greater hazard of blue light. The light color of the low color temperature is yellowish, giving a warm and comfortable feeling.
Fourth, the color rendering index Ra
We refer to the degree to which the light source represents the true color of the object as the color rendering of the source. The standard of measure is the color rendering index. The higher the index, the less color distortion is seen, and the color rendering index for sunlight is 100.
Shopping advice: The national standard requires Ra to be greater than 80 for daily use. If you are engaged in color-related work, then the color rendering index of the luminaire must be very high, then you can only choose incandescent lamps, even if other types of luminaires can reach 95, do not buy.
The life of a luminaire actually has two parts, and the shorter life is taken as the life of the whole lamp.
1. Time required for the luminous flux of the whole lamp to decrease to 70% of the initial value
2. The time from the ignition to the burnout of the whole lamp For the LED lamp, the second one is much shorter than the first one. The LED life that is often claimed in the market is as long as 5W-10W hours, referring to the first life time. The second test is the manufacturer’s LED drive capability and thermal design capabilities.
Shopping advice: Choose a reliable brand manufacturer’s lamps, the longer the nominal life, the better. Note: The life of most LED lights is marked for 10 years, but the calculation method is like this – the whole lamp life is Y hours / X hours per day = 10 years, this “lighting X hours every day” will make up a 10 years. The national standard stipulates that the life of the whole lamp is more than 25,000 hours (the calculation of this time is relatively round, and the second item is avoided to some extent). The time declared by each manufacturer ranges from 6000H to 25000H, PS: traditional incandescent lamp (3000H) and The first time of fluorescent light (6000H) is much shorter than the second one, so many traditional lamps have reached the end of their life and can be lit. They should be replaced in time.
Sixth, PF value
The PF value is the ratio of the active power consumed by the luminaire to the apparent power. This item is not a parameter of the quality of the luminaire. It is only related to the load of the grid. Thanks to the low power consumption of the LED lamp, the impact is limited. However, some sales people often claim that the higher the PF value, the more power-saving the lamp, the better the quality, which is unfounded.
Optional advice: For low power (10W or less) lamps, do not consider this parameter. The state stipulates that the PF of lamps below 5W shall not be less than 0.4, and the PF of lamps above 5W shall not be less than 0.7.
Seven, dimming performance LED driver can have a lot of playability, there are many lamps in the market claim to be able to adjust brightness, color temperature, color and so on. All kinds of LED lamps, such as wifi, Bluetooth, etc., are toys with a freshness of 5 minutes. They are not used for lighting, and the price is more expensive. It is not recommended to buy. Traditional dimmer LED luminaires have dimmer matching problems and are not recommended for purchase.