Civil Engineering Reference
In-Depth Information
lamp efficiency is 100 lm/W; the lamp + ballast efficiency is 89.3 lm/W. The CU
coefficient is 60 %.
The new lighting system includes 1,372 LED lamps and luminaires with 30 W
input power per lamp and dimmer input power of 0.6 W (roughly 2 % of the lamp
power) per lamp. The initial lamp efficiency is 100 lm/W; the lamp + dimmer
efficiency is 98 lm/W. The CU coefficient is 90 %.
The details of the energy-saving evaluation are shown in Table
14.8
which is
derived from the worksheet of Table
14.6
.
The annual energy saving is equal to 135,802 kWh.
See Table
19.4
for the economic evaluation.
