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What meaning do P54 express?

Hits:  UpdateTime:2015-06-16 10:57:23

Reply: International Electric Committee rules lamp the crust the dustproof, waterproof rank by alphabet IP (protect guideline) the heel two numbers express. First number expresses dustproof the level, the second numbers level waterproof. Ip54 expresses lamp dustproof for 5 levels, 4 waterproof.
133, What meaning of using lamp defends coefficient ?
Reply: lamp during use, due to light source light quantity will gradually weaken; lamp within and without surface can accumulate the dirt and other dirty things, lamp reflects light board is corrupted, cause such efficiency to gradually bring down, merely export gradually cut down, thereby cause illumination standard on road surface to gradually drop. For guarantee illuminate design to count accuracy, must draw to defend the coefficient.

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