Luminous performance of common light fittings are essential to estimate and optimize lighting load at home, office or industry. Lumen/ watt differs with the type of lamp used. Based on the quality of light and energy requirement right lighting selection will not only improve visibility but also reduce energy cost. Lumen is not only should be selection criteria, it should be checked along with CRI and S/P ratio. For S/P Ratio click here
Let us discuss about luminous performance of common light fittings:-
| Type of Lamp | Lumen/watt Range | Lumen/watt Avg | Color rendering index | Typical application | Typical hours |
| Incandescent | 8-18 | 14 | Excellent (100) | General Lighting (Homes, restaurants, etc) | 1000 |
| Florescent lamps | 46-60 | 50 | Good w.r.t coating (67-77) | Offices, shops, hospital, homes | 5000 |
| Compact florescent lamps (CFL) | 40-70 | 60 | Very good (85) | Hotel, shops ,hospital, homes | 8000- 10000 |
| High pressure mercury (HPMV) | 44-57 | 50 | Fair (45) | General lighting in factories, garages, car parking, flood lighting | 5000 |
| Halogen lamps | 18-24 | 20 | Excellent (100) | Display, flood, lighting, stadium, exhibition grounds, construction areas | 2000- 4000 |
| High pressure sodium(HPSV) SON | 67-121 | 90 | Fair(22) | General lighting in factories, ware, houses straight lighting | 6000-12000 |
| Low pressure sodium(LPSV) SOX | 101-175 | 150 | Poor(10) | Roadways, tunnels, canals, street, lighting | 6000-12000 |
| Metal halide lamps | 75-125 | 100 | Good(70) | Industrial bays, spot lighting, flood lighting, retail store | 8000 |
| LED lamps | 50-130 | 90 | Very good (80) | Office, Industry, outdoor, retail, hospitality, etc | 30000-60000 |
| Induction lamp | 65-90 | 75 | Very good (80) | General lighting, factories, warehouses, street lighting , flood lighting | 60000-100000 |
Colour RenderingIndex: – Is a measure of the effect of light on the perceived colour ofobjects. A low CRI indicates that some colour may appear unnatural when illuminated by the lamp.
Please note Luminous performance of common light fittings are important but it should be looked together with S/P ratio , Please click here for understanding S/P ratio
