What is the difference between indoor and outdoor lamps?The typical difference is: most of the time, there is a roof to protect indoor lamps from wind and rain, but it’s more easily to exposed to rain and dust if lights are installed outdoor.Therefore, as to outdoor lighting, they must have strict requirements for dust and water resistance, and we will divide the protection level of the shell according to the degree of dust and moisture resistance, usually using the protection class code IP.The code represents the level of protection, usually consists of the characteristic letter IP plus two characteristic numbers. The first number refers to dust prevention(from 0 to 6, higher number represents stricter dust prevention); The second number refers to water resistance(from 0 to 8, higher number represents stricter water resistance).If you’re interested in more datails of IP level, please contact us.