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Luminous Flux (781 words) |
 | The luminous flux is the part of the power which is perceived as light by the human eye, and the figure 683 lumens/watt is based upon the sensitivity of the eye at 555 nm, the peak efficiency of the photopic (daylight) vision curve. |
| For instance, the Luminous Flux for a 100W incandescent lamp is approximately 1700 lm. |
| This is the Luminous Flux for that lamp. |
| Lighting definitions (365 words) |
| Luminous flux is the quantity of the energy of the light emitted per second in all directions. |
| Luminous intensity is the ability to emit light into a given direction, or it is the luminous flux that is radiated by the light source in a given direction within the unit of the spatial angel. |
| Luminance L is the luminous intensity emitted by the surface area of 1 cm² (or 1 m²) of the light source. |
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