... ) NG150, NG250, NG400 2) Average life: 10,000h High Pressure Sodium Lamps (Twin Burners)1) NG150, NG250, NG400 2) Average ... : 1) Compact size 2) High efficiency 3) Long using life 4) High maintained light output 5) Used for ... road lighting, amenity areas, car parks, area floodlighting, warehousing, industrial units 6) Twin burners High Pressure Sodium Lamps ...