Each LED lamp with protection circuit, a single light-emitting tube damage does not affect the electrical properties of the whole lamp. Optics: red, yellow, single LED luminous intensity of not less than 4000mcd-6000mcd, Green single LED luminous intensity of not less than 6000mcd-8000mcd Color: red (627-629nm) Green (504-506nm) Input rated voltage: 220V ± 10% 50Hz Rated Power: ≤ 15W Insulation resistance: between live parts and case insulation resistance greater than 10MΩ, dielectric strength greater than 1.5KV Operating temperature: -40 ℃ ~ +80 ℃ Life:> 100000h shell protection grade: dust IP5X, Waterproof IPX3 Effective viewing distance:> 500m