好看韩国三级中文字幕hd,成年在线观看视频免费看,又黄又爽的成人免费视频播放,黄片一区2区三区

What is the easiest way to determine the quality of LED lights?

    Buy lamps do not buy the ridiculously low price of the product, regardless of the seller what reason. How there will be qualified because of the very low price of even the costs are not enough to ensure this? More than ask the customers about the products power factor, and the conversion efficiency of the light source chip, power protection features. Want to buy a good product, and do not excessively low prices.

     Comparison of the actual power and the power of the light source of the lamp. His actual power such as a 3 * 1W LED spotlight 3.8W-4.3W actual power is much larger than the standard description of the problem, the conversion efficiency is too low. Lights up one to three hours the temperature of the test lamp housing (Remember Do not hold your hand, gently touched down just fine), the temperature should not exceed 70 degrees (LED lamps with international standards is a temperature difference can not be more than 40 degrees). Sound in the quiet environment to listen to the work of the LED lamps. If you can hear the the lamps work of sound, very obvious lighting power is not good.
Identify good light, spotlight lens is covered with an A4 print paper, the color of the observation light, and then slowly removed. (Not directly facing the lamp to face in order to avoid strong light bad eyes) a good light source emits light clear thorough very uniform, hand on the poor is very mixed, or easily see several light sources is not the same color light color, do not uniform. Good new buy LED lamps fitted after repeated fast switching dozen times. If I can not hear the sound in the LED lights work while not exterminate, then this LED light is fairly stable. www.ledtubes8.com