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Top Ten Quality Indexes for LED Tube Lights

LED tube lights, as one of the commonly used indoor LED lamps, is widely applied in our daily life today. Office, home improvement, commercial center,etc, the wide range of LED tube lights application makes it popularly accepted by users. However, how to select the proper LED lights tube is one big problem for us. Here are ten indoor LED lighting quality indexes that help you distinguish high quality LED tube lights.

1.Correlative Color Temperature(CCT)

Correlative Color Temperature(CCT) is defined as one way to measure the light color, which is indicated by Kelvin(K) temperature. Indoor LED lighting color temperature range varies from 2800K-6500K.

LED tube light adopts white light LED as light source. Correlative Color Temperature(CCT) is the unique way to describe white light color. Bellow is the spectrogram of LED vs traditional various lights source.

spectrum of led

Picture One: Spectrum for LED


spectrum of daylight&incadescent&fluorescent

Picture Two: Spectrum for Daylight&Incandescent&Fluorescent


Above is the spectrum of LED, sunlight, incandescent and fluorescent light source comparison. Daylight contains saturated spectral components. Of the three artificial light source, traditional fluorescent spectral components are sparse and thin, and ultraviolet component in fluorescent is harmful to human body. Conventional incandescent spectral components are rich. However, the light color is not so pure as LED light with larger portion of red and yellow light wave. Moreover, the heavy energy loss of incandescent lamp is a big cost. While LED spectral components are pure with no UV and IR. The mid spectrum is uniform, which is nice and friendly to our eyesight. Undoubtedly, LED is to be the most promising light source in the future.

2.Color Rendering

Color Rendering is one quantitative method to measure the ability of the light source revealing various objects, indicated by Color rendering index(CRI). CRI range from 0-100Ra. As a rule, sunlight, with its abundant spectral components, is regarded as the best light source. Sunlight CRI is defined as 100Ra. CRI for artificial light source is less than 100Ra. The higher is the color rendering index, the better the object color can be revealed. CRI for LED is classified into three levels: CRI<69Ra, 70Ra80Ra. High CRI LED is the best choice for indoor LED lighting.

While you are choosing high CRI LED tube lights for your lighting plan. Here is one simple way to tell you how to distinguish high quality CRI LED tube light. Make a comparison of your palm skin color in the sunlight or LED lights. Reddish palm skin color indicates LED tube light adopt high quality CRI LED while yellowing palm skin color is a fake one.

CRI Testing method


3.Illuminating Value

Illuminance, in photometry, is the total flux incident on the object surface on the unit area. It is the quantitative measure of how much incident light illuminates object surface to correlated with human brightness perception. It is measured by lux. The higher is the illuminance value, brighter is the lighted object.

Generally, two factors can influence the illuminance value. One is the distance between light source and object and the other is distribution curve flux. The more is distance between light source and object, the thinner is the brightness. Meanwhile, small output beam angle makes object incident brighter and higher.

Illuminance value affected by light distribute curve and distance value


For LED lights tube, illuminance value is measured by integrating sphere. Too high or too low illuminance value is harmful for human eyesight. For indoor application, LED lights tube illuminance value is designed in accordance with national illuminance standards.

4.Light distribution curve

Light distribution curve is another significant factor that matters lighting quality. Standard layout and good light distribution curve for indoor LED lamps can improve the visual performance and ocular dominance.

For LED lights tube, qualified LED lights tube structural design can alter light output distribution to achieve the appropriate light distribution beam angle. Generally, smaller is the beam angle, brighter we can feel.

Different LED lamps have different light distribution, which depends on its own illumination function. Usually, LED track spotlight and ceiling adopts 15º-30º light output distribution. LED down light uses 30º-60º, and LED tube light 100º-120º.

5.Conversion Efficiency

We define conversion efficiency as the ratio of luminosity to power supply, measured by lm/w. The higher is the conversion efficiency, the more energy saving can you get. LED lights conversion efficiency ranges from 90 to 130lm/w, CFL 48-80lm/w, and incandescent 9-12lm/w.

For LED tube lights, its light source conversion efficiency is 90-130lm/w. While defective LED light source will eventually reduce conversion efficiency to 60-80lm/w. So choosing high quality LED as LED tube lights light source can finally improve your lighting effect.

6.Luminaire efficiency

Luminaire efficiency is defined as the ratio of lamps light output luminosity to light source luminance. Similar to conversion efficiency, luminaire efficiency is one important factor to evaluate lights quality.

7.No Glare

Glare is the uncomfortable feeling our eyesight adjusts to light source. Dazzling feeling of light is one big problem in LED lighting application. Now anti-dazzling screen or diffuser is used to avoid the glare.

8.No Strobe

Strobe can resort to human eyesight visual fatigue. Minimal strobe time can reach up to 0.02s, which is lower than our visual retention time. So in normal condition, human eyes can not detect lighting strobe. However, ocular cell system can be affected by the strobing.

9.Safety Requirement

Safety requirement for LED tube light is highly assessed by different countries. For LED tube light safety requirement, it mainly includes electric leakage, electric shock, burning, blast, installation reliability, security identity, AE identity,etc.

10.Energy Saving Requirement

Good quality LED tube lights can help users save a lot on electricity bill. So the overall energy saving performance is here involved when selecting excellent LED tubes. Its primary indexes contain: thermal management, power efficiency for LED driver, conversion efficiency and luminaire efficacy,etc.





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