Compared with traditional light sources, LED high bay light is based on the new way of semiconductor solid-state lighting (SSL). LED products have many different parameter relationships. The following parameter relationships need to be properly mastered.
First, light efficiency and luminous flux
The ratio of the total luminous flux emitted by the light source to the electrical power (watts) consumed by the source is referred to as the efficacy of the source. The higher the luminous efficiency value, the stronger the ability of the lighting fixture to convert electrical energy into light energy, that is, the greater the energy saving of the lighting fixture when the same brightness is provided; the illumination of the lighting fixture is the same under the same power. Strong, that is, the brightness is greater.
The amount of light emitted by the led light source per unit time is called the luminous flux of the led light source. Unit: Lumen, ie lm. This amount is for the light source, it is the size of the total amount of light emitted by the light source, and is equivalent to the optical power. The greater the luminous flux of the light source, the more light is emitted.
Under the same driving current, due to the different junction voltage of the LED, the luminous efficiency of the lamp bead is highly variable, and high lumens are not meant to be high-efficiency products. LED high bay light fixtures, high light efficiency is the main energy-saving indicator.
Second, color temperature and brightness
Under the illumination of high color temperature light source, if the brightness is not high, it will give people a cold atmosphere; under low color temperature light source, the brightness will be too high, which will give people a feeling of stuffiness. Comparison of light color: In the same space, two kinds of light sources with large color difference are used, and the contrast will have a layer effect. When the light color contrast is large, the level of light color can be obtained while obtaining the brightness level.
Third, color rendering
The degree to which the light source appears to the color of the object is called color rendering, that is, the degree of color fidelity. The light source with high color rendering has better color reproduction. The color we see is closer to the natural primary color, and the color rendering is low. The light source’s reproduction of the color is poor, and the color deviation we see is also large.
Fourth, consistency issues
The consistency of LED lighting products mainly includes the following aspects:
1) Power consistency, under constant current drive, the power is reduced as the lighting time increases after the lamp is turned on. This phenomenon is normal. For a drive with a large deviation of constant current accuracy, the power value will vary with the input voltage. And change. Inconsistent power does not mean that there is a problem with quality.
2) The consistency of color temperature, this inconsistency can be passed as long as the human eye can pass. After all, the color temperature control of high bay light has always been a problem, and the problem of low-priced products will be very serious.
3) The consistency of light efficiency will lead to differences in luminous flux. High-quality products will be well controlled, but the consistency of light efficiency cannot be judged to be inferior products. High luminous efficiency does not mean high lumens, and often high-efficiency products. The power is also low, and the light efficiency is the main indicator for measuring the energy-saving effect. For users of LED light sources and lamps, light efficiency is the first indicator of concern.
Fifth, temperature and life
The traditional light source is not sensitive to temperature, and the LED light source is a product with a common fate. The ambient temperature and working temperature of the product directly determine the life of the product. The semiconductor device is temperature dependent. From this perspective, the life of the driving power source is also determined by The temperature is determined, so the life of the LED lighting product depends on the temperature control. This temperature includes two aspects, one is the temperature of the working environment, the higher the ambient temperature, the lower the product life, and the other is the heat dissipation capability of the lighting product itself. The better the heat dissipation capacity, the longer the product life. However, when a product with high heat dissipation capacity is placed in a place with high ambient temperature, the life of the product is also low. The product operator needs to know the temperature of the working environment of the customer to make it reasonable. The warranty period, otherwise, high-quality product after-sales service will reduce the credit of your e-commerce platform, the temperature and life of LED lighting source is an inherent problem of semiconductor solid-state light source.
Sixth, the efficiency of the drive power
Many products are marked with light source efficiency, often ignoring the efficiency of the driving power supply. Power efficiency is the ratio of the power output power to the power input power. In simple terms, it is the power loss of the power supply itself, the internal loss of the power supply is low, and the power efficiency is low. High, low power supply, long power supply life, power efficiency should distinguish between isolated drive and non-isolated drive. The efficiency of non-isolated drive power is high, generally above 90%, the efficiency of isolated drive power is generally around 80%, but isolated drive The safety performance of the power supply is high, and the price is more than double that of the non-isolated power supply. The efficiency of the driving power supply is a problem worthy of attention, and the efficiency of the driving power supply affects the life of the product.
Seven, the importance of lighting efficiency
Lamp efficiency is an important indicator of international lighting products. It is the main parameter for measuring the cost performance of lighting products. The lamp efficiency is the loss rate of the luminous flux of the light source.
The more luminous flux the lamp loses, the lower the efficiency of the lamp, the different lamps. The efficiency is different, the luminaire efficiency is between 50% and 90%. A light source with a luminous flux of 1000 lumens is placed in a luminaire with a luminous efficiency of 50%.
Only 500 lumens of light output, the luminaire efficiency will reduce the high luminous efficiency of the LED light source. In the same level as the energy-saving lighting effect, the luminaire efficiency is the final indicator to measure whether the lighting product is energy-saving. The luminaire efficiency needs professional testing to get it.
The operator needs to use the luminaire efficiency as the main indicator to measure the cost performance. 50% of 10W lighting products, the lighting effect is only equivalent to the purchase of 6% of the efficiency of the 6W products, the operators themselves calculate the electricity costs saved for consumers.