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Measured

Required

Time

lighting intensity*

additional lighting

08:00 – 08:30

7 lx

246 lxh

08:30 – 09:00

21 lx

240 lxh

09:00 – 09:30

44 lx

228 lxh

09:30 – 10:00

147 lx

176 lxh

10:00 – 10:30

217 lx

141 lxh

10:30 – 11:00

265 lx

117 lxh

11:00 – 11:30

352 lx

148 lxh

11:30 – 12:00

371 lx

129 lxh

12:00 – 12:30

429 lx

71 lxh

12:30 – 13:00

633 lx

0 lxh

13:00 – 13:30

458 lx

21 lxh

13:30 – 14:00

547 lx

0 lxh

14:00 – 14:30

1276 lx

0 lxh

14:30 – 15:00

1263 lx

0 lxh

15:00 – 15:30

1508 lx

0 lxh

15:30 – 16:00

1830 lx

0 lxh

16:00 – 16:30

1988 lx

0 lxh

16:30 – 17:00

2000 lx

0 lxh

Potential savings for this room:

approx. 66 %

Measured values for the lighting intensity in the laboratory under examination [Lux]

*averaged over the usage period

2CDC 500 060 M0201 11

In the ABB field studies the constant light control always yielded savings of more than 25 % in comparison to manual lighting operation.

Measurement 3, October 2008 Laboratory, second floor, sunny day, open blinds, test and usage period from 8:00 a.m. to 5:00 p.m.: Additional lighting of 1,517 lxh was required. If the lighting had been switched on without control, it would have resulted in a consumption of 4,500 lxh.

Calculation of the additional lighting requirement:

Results:

  • 1.

    A high-level of potential savings with regard to the electrical energy are possible with constant lighting control.

  • 2.

    A generally valid statement concerning the level of savings is difficult. The result depends on several individual factors, e. g. daylight factors, alignment of the room, surrounding buildings, etc.

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