Efficiency and environmental impact

Approximately 90% of the power consumed by an incandescent2SK1522

 lamp is emitted as heat, rather than as visible light.The strength of an electrical lighting source is dependent upon two factors, the relative visibility of electromagnetic radiation, along withLT1640L

 the rate of which the origin converts electric power into radio waves.Luminous efficacy of your light source is a ratio in the visible light energy emitted (the luminous flux) for the total power input towards the lamp.[39]HSP45102SI-33

 Visible light is measured in lumens, one that is defined in part from the differing sensitivity of the human eye to be able to wavelengths of light. Not all wavelengths of visible electromagnetic energy are equally effectiveMHW720A1

 at stimulating the human being eye; the luminous efficacy of radiant energy can be a way of measuring how well the distribution of their time matches the perception from the eye. The maximum efficacy possible is 683 lm/W for monochromatic green light at 555 nanometres2SK3595

 wavelength, the peak sensitivity in the eye. For white light, the most luminous efficacy is around 240 lumens per watt, nevertheless the exact value is just not unique as the human eye can perceive many different mixtures of visible light as "white".