1. Inspection certificate of approval, new gas discharge lamp has supplied with technical documents; 2. Appearance inspection: coating of lamps and lanterns is complete, no damage, the attachment is complete. Explosion-proof lamps and lanterns of explosion protection marks and Numbers of qualified nameplate, ordinary and other safety certification marks; 3. To complete the insulation resistance of lamps and lanterns, internal wiring of on-site sampling detection performance. The insulation resistance of lamps and lanterns is not less than 2 m Ω, internal wiring for copper insulated wire, conductor cross-sectional area not less than 0. 5 was, rubber or PVC ( PVC) Insulated wire insulation layer thickness of not less than 0. 6mm. Lamps and lanterns at the swimming pool and similar sites ( Underwater lamp and waterproof lamps and lanterns) Any objection, airtight and insulation performance by batch sampling qualified laboratory testing.