400W MH/HPS Aluminum Housing Tunnel Lamp Iron housing, tempered glass, E40 MH/HPS/LED/Induction lamp Electro-static plastics 400W MH/HPS Aluminum Housing Tunnel Lamp Features:1. Iron housing ... . Protection class:IP656. Application places:subway station,tunnel and bridge etc.7. HPS/MH E40 400W MAX Application:Subway station, tunnel and bridge etc.