The main parameters of LED lights:
1.Color temperature: conventional color temperature: warm white light (WW) 2700-3200k, natural light (NW) 4000-4500K, positive white light (PW) 6000-6500K, cold white light (CW) 7000-7500k [here the difference between cold white light and jewelry lights Cold white light, cold white light of jewelry lamps is generally 15000-20000K] In addition, red, green, blue and other single color lamp beads chang can also be made.
2.Power: The general power of LED bulbs is below 12W. The power of common LED bulbs is divided into: 3w, 4w, 5w, 6w, 7w, 8w, 9w, 10w.
3.Voltage and current: Voltage and current are also important basic parameters of LED bulbs. The grid voltage in different countries in the world and the voltage used in some occasions are different. The commonly used voltages are 12v, 110v, 220v, 85v-265v. Current is divided into input current and lamp current. First: input current: it can be tested by power supply. Different powers are different, which depends on the instrument. Second: Lamp bead current: Generally high power is between 300mA-320mA-. The current has a great influence on the light attenuation of the LED lamp, so the stability of the current is also important. The current and voltage of the lamp beads cannot be too large, otherwise the life of the LED lamp will be seriously affected.
4.Light effect: Light effect is also a very important factor for LED bulbs. The higher the luminous efficiency value, the stronger the ability of the lighting equipment to convert electrical energy into light energy, that is, the energy-saving performance of the lighting equipment is greater under the condition that the same brightness is provided; the more illuminating the lighting equipment is at the same power Strong, that is, the greater the brightness. At present, the light efficiency of chips on the market is basically around 100-150Lm / W.
5.Luminous flux: The luminous flux is mainly determined by the light efficiency and power of LED bulbs. It is generally measured with an integrating sphere.
6.Illumination: Illumination is generally considered by many lighting designers. Generally, we rarely consider it. The unit of illuminance is Lux, English is Lux, and it can also be abbreviated as Lx now. 1 Lm of luminous flux produced by evenly distributing the light on a 1 square meter surface. Illuminance is usually measured with an illuminance meter. The illuminance meter is simple to use and cheap to purchase. When there is no integrating sphere system, the illuminance meter can be used as a reference. .
7.Luminous decay: In common words, luminous decay is how much the brightness of a bulb lamp decreases after a certain period of use. The most important factors affecting LED light decay are heat dissipation and current. The current is unstable, the heat dissipation effect is poor, and the light decay will be serious. If the LED light bulb uses an isolated constant voltage + constant current LED driving power source and the aluminum lamp shell for heat dissipation, the light attenuation is controlled within 2%.
8.Chromatic aberration: Chromatic aberration is the inconsistency of color temperature. Generally, warm white light (2700-3200k) will consider chromatic aberration. Warm white light is the yellow light that we usually say. Sometimes we buy two energy-saving lamps of the same brand and with the same power that emit yellow light. When they are lit in the same environment, one light color is brighter and one light color is darker. This situation is color difference. In some cases, chromatic aberration is not allowed.
9.Color rendering: the degree to which the light source renders the color of the object itself is called color rendering, that is, the degree of color fidelity; the color rendering of the light source is indicated by the color rendering index, which indicates that the color of the object under the light is relative to the benchmark The color deviation of light (sunlight) illumination can fully reflect the color characteristics of the light source. Light sources with high color rendering perform better on colors, and the colors we see are close to natural colors. Light sources with low color rendering perform poorly on colors, and the color deviations we see are also large. The International Commission on Illumination CIE sets the color rendering index of the sun to 100, and the color rendering indices of various types of light sources are different, such as: color rendering index Ra = 23 for high pressure sodium lamps, and color rendering index Ra = 60 ~ 90 for fluorescent tubes. There are two types of color development: faithful color development: To accurately represent the original color of a substance, a light source with a high color rendering index (Ra) is required. Effect color development: To emphasize specific colors clearly, the life of beauty can use color addition method to enhance the color development effect.
10.Glare: If there is a very bright object or strong brightness contrast in the field of vision, it can cause visual discomfort called glare. Glare is an important factor affecting the quality of lighting.
11.Service life: In the general description, LEDs can be used for more than 50,000 hours, and some manufacturers claim that their LEDs can operate for about 100,000 hours. The main problem in this regard is that LEDs are not simply no longer operational, and their rated service life cannot be calculated using traditional light fixture measurement methods. In fact, when testing the life of an LED, no one will stay by and wait for it to stop working. However, there are other ways to measure the life of an LED. LED is durable because it does not cause the problem of filament blown. LEDs do not stop working directly, but they gradually degrade over time. Some predictions show that after 50,000 hours of continuous operation, high-quality LEDs can maintain more than 60% of the initial light brightness. Assuming that the LED has reached its rated life, it may actually be glowing, but the light is very weak. In order to extend the life of LEDs, it is necessary to reduce or completely dissipate the thermal energy generated by the LED chips. Thermal energy is the main reason why LEDs stop working.