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ABB field studies Our own experience with constant lighting control

In almost all the technical literature, constant lighting control is frequently accredited with a high level of potential savings for electrical energy. ABB examined the accuracy of these statements and the specific potential saving values in its own series of tests. The measurements were performed in an office building with seminar rooms.

Using constant lighting control – in contrast to a lighting that is fully switched on – the required lighting intensity in the room is achieved by the continuous and controlled addition of “artificial lighting” required to maintain a defined level of brightness (in these measurements: 500 Lux). Only the amount of energy that is necessary for the artificial lighting is therefore consumed.

Measured

Required

Time

lighting intensity*

additional lighting

08:00 – 08:30

25 lx

237 lxh

08:30 – 09:00

90 lx

205 lxh

09:00 – 09:30

120 lx

190 lxh

09:30 – 10:00

190 lx

155 lxh

10:00 – 10:30

210 lx

145 lxh

10:30 – 11:00

140 lx

180 lxh

11:00 – 11:30

150 lx

175 lxh

11:30 – 12:00

180 lx

160 lxh

12:00 – 12:30

220 lx

140 lxh

12:30 – 13:00

200 lx

150 lxh

13:00 – 13:30

180 lx

160 lxh

13:30 – 14:00

170 lx

165 lxh

14:00 – 14:30

120 lx

190 lxh

14:30 – 15:00

40 lx

230 lxh

15:00 – 15:30

50 lx

225 lxh

Measurement 1, October 2008 Training room, ground floor, cloudy day, open blinds, test and usage period from 8:00 a.m. to 3:30 p.m.: Additional lighting of 2,707 lxh was required. If the lighting had been switched on without control, it would have resulted in a consumption of 3,750 lux hours (lxh).

Calculation of the additional lighting requirement:

Potential savings for this room: *averaged over the usage period

approx. 28 %

Measured

Required

Time

lighting intensity*

additional lighting

08:00 – 08:30

12 lx

244 lxh

08:30 – 09:00

35 lx

232 lxh

09:00 – 09:30

50 lx

225 lxh

09:30 – 10:00

65 lx

218 lxh

10:00 – 10:30

90 lx

205 lxh

10:30 – 11:00

100 lx

200 lxh

11:00 – 11:30

140 lx

180 lxh

11:30 – 12:00

265 lx

118 lxh

12:00 – 12:30

350 lx

75 lxh

12:30 – 13:00

370 lx

65 lxh

13:00 – 13:30

370 lx

65 lxh

13:30 – 14:00

350 lx

75 lxh

14:00 – 14:30

315 lx

92 lxh

14:30 – 15:00

265 lx

118 lxh

15:00 – 15:30

235 lx

132 lxh

15:30 – 16:00

160 lx

170 lxh

16:00 – 16:30

100 lx

200 lxh

16:30 – 17:00

87 lx

206 lxh

Potential savings for this room:

approx. 37 %

Measurement 2, October 2008 Conference room, first floor, very cloudy day, open blinds, test and usage period from 8:00 a.m. to 5:00 p.m.: Additional lighting of 2,820 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:

*averaged over the usage period

10 2CDC 500 060 M0201

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