Incandescent lamps efficacy

A number of new technology promotion options are being explored in the lighting area. Work is undeiway on market transformation programs based on bulk procurement for improved efficacy incandescent light bulbs and for compact fluorescent lamps and fixtures. For incandescent lamps, adaptations of the infrared reflective lamp coating that is already in use on reflector bulbs are encouraged by the EPAct requirement. 

The selection of the source of light appropriate to the circumstances depends on several factors. It is important to consider efficiency, ease of installation, costs of installation and running, maintenance, lamp life characteristics, size, robustness and heat and colom output. The efficiency of any lamp (often termed efficacy) can be expressed in terms of light output per unit of electricity used (lumens per watt). Generally speaking, incandescent lamps are less efficient than discharge sources. 

Fig. 1.1 History of luminous efficacy for incandescent, halogen, fluorescent, sodium-vapor lamps, and white LED. Adapted from Ref. [12] lOP Publishing. Reproduced with permission. All rights reserved...

Figure 28.1 Evolution in the luminous efficacy of distinct light sources. The curves of incandescent, halogen, high-intensity discharge (HID) (including mercury vapor, metal halide, and sodium vapor lamps), and fluorescent lamps are adapted from Ref. [8]. The LED curve is built based on data reported by Kovac et al. [16] and Farinola and Ragni [13] and the...

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