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| Luminaire and lamp systems | ||||
| Ìý | Capital cost (£) | Net present value for 60 years (£) | Average service period (hours) | Energy consumption* |
| Internal lighting | Ìý | Ìý | Ìý | Ìý |
| Tubular fluorescent lamps 3 × T8, 18 watt. Luminaire: recessed in ceiling, 600 mm × 600 mm, with stove enamel steel or aluminium spine, UV stabilised diffuser | 97 | 526 | 13,000 | 12-18% |
| Compact fluorescent lamp, 28 watt. Luminaire: ceiling-mounted, circular polycarbonate cover, aluminium body | 45 | 329 | 9,000 | 18% |
| Tungsten filament bulb 60 watt. Luminaire: glass diffuser fitting | 35 | 450 | 1,000 | 100% |
| External lighting | Ìý | Ìý | Ìý | Ìý |
| High pressure sodium lamp, 70 watt floodlight. Luminaire die-cast aluminium polyester powder-coated, with control gear IP65 rated for external use | 175 | 836 | 24,000 | 11% |
| Metal halide lamp, 70 watt floodlight. Luminaire die-cast aluminium polyester powder-coated, with control gear IP65 rated for external use | 175 | 1,183 | 11,000 | 15% |
| Induction lamp, 70 watt floodlight. Luminaire die cast aluminium polyester powder-coated, with control gear IP65 rated for external use | 317 | 1,223 | 60,000 | 18% |
| * 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 | ||||
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