还有客户来问玻璃灯管的L / B format 懵逼了 防撞等级
Q:还有客户来问玻璃灯管的L / B format 懵逼了。A:欠学 , IK指数是什么 , 代表什么??L / B format ???
Q:IK 防冲击等级...
A:防撞等级
Q:对 , 挨K， 受教 !!!!
A:一般玻璃灯管最多ik6
Q: LED and lifetime
One of the benefits of the LED is its long lifetime. Because they have no movable parts or filaments that may break, LED's can have long lifetime.
The light output from all light sources, LED, halogen, metal halide and fluorescent decreases over time. The amount of light from the light source at a specific time in the future is referred to as the lamp lumen maintenance factor, or LLMF. The lifetime of a LED module is defined as the time it takes until its light output, or lumen maintenance, reaches 70% of the initial output. This is also called L70. In other words, the module does not die instantly as many conventional light sources do, it slowly dims down. Lighting planners take this effect into account when they dimension the lighting installation. As they want the light level to reach a minimum lux value at the end of the lifetime, they over-dimension the luminaire installation, often by using more luminaires. Therefore, the lux value in the beginning of the operating life of the lighting installation is higher than what it is at the end. The luminaire industry has standardised LED lifetime to L70 = minimum 50000 hours, which corresponds to an LLMF of 0,7 as long as the lifetime of the lighting installation is set to the same amount of hours.
The actual lifetime of a LED luminaire is important for cost savings
For some of our products, the lumen degradation is better than the industry standard. After 50000 hours of life, not only 70% of the life remains, but 80% or even more. The LLMF is then raised to 0,8 or above and the lighting designer does not need to over-dimension the lighting installation as much. With this upgrade, up to 25% of the luminaires may be left out, depending on the ceiling type. That means lower installation costs and a lower energy bill. At the same time, the lux levels are always meeting the lighting norm requirements. In our datasheets this is shown as Lx = 50 000 hours at 25 deg ambient temperature (Ta).
New standards on LED lifetime
New International standards on
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