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Luminaire and lamp systems
ÌýCapital cost (£)Net present value for 60 years (£)Average service period (hours)Energy consumption*
Internal lightingÌýÌýÌýÌý
Tubular fluorescent lamps 3 × T8, 18 watt. Luminaire: recessed in ceiling, 600 mm × 600 mm, with stove enamel steel or aluminium spine, UV stabilised diffuser9752613,00012-18%
Compact fluorescent lamp, 28 watt. Luminaire: ceiling-mounted, circular polycarbonate cover, aluminium body453299,00018%
Tungsten filament bulb 60 watt. Luminaire: glass diffuser fitting354501,000100%
External lightingÌýÌýÌýÌý
High pressure sodium lamp, 70 watt floodlight. Luminaire die-cast aluminium polyester powder-coated, with control gear IP65 rated for external use17583624,00011%
Metal halide lamp, 70 watt floodlight. Luminaire die-cast aluminium polyester powder-coated, with control gear IP65 rated for external use1751,18311,00015%
Induction lamp, 70 watt floodlight. Luminaire die cast aluminium polyester powder-coated, with control gear IP65 rated for external use3171,22360,00018%
* Energy consumption figures, based on DETR data, are relative to a tungsten filament bulb, which has been included in the analysis for comparative purposes only