Use phase

Incandescent and energy-saving lamps are used everywhere: in business and industry as well as in the home; however the incandescent lamp is used much more commonly in the private household. More common in the business place is the energy-efficient fluorescent tube. Because of economic reasons already discussed, white LEDs are still used mostly in spe cial applications. In order to nonetheless assess and compare potential environmental impacts for the entire field, white LEDs are compared in this case study to conventional light sources.

The use phase is of major consequence in the life cycle assessment profile, as light sources are a significant consumer of electrical energy in this phase. The energy consumption is based upon the production of a specific reference light quantity (RLQ), which serves as an equivalence value. Specific energy consumptions of the variants are derived from multiplying power input, service life, and number of lamps required.

Table 36. Energy consumption of each case-study variant91

RLQ = 6.579

Variant 1

Variant 2a

Variant 2b

Variant 3a

Variant 3b

Mlmh

incandes-

Dulux EL

Dulux EL

white LED

white LED

cent lamp

15

Longlife

of today

of tomorrow

Power input

75

15

15

1

1

(W)

Service life (h)

1000

8000

13000

15000

15000

Lamps required

7,33

1,00

0,56

24,36

6,71

for RLQ (quan-

tity)

Energy con-

550

120

109

365

101

sumption for

RLQ (kWh)

Emission factors for the current electrical power mix in Germany as taken from the GEMIS 4.1 database and listed in the appendix (Table 56) form the basis for the calculations of environmental impacts in the use phase (GEMIS 4.1 2003).

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