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Originally Posted by chav1
wouldnt it be a good idea for motorway lights to do the same to save electricity
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No. If you wanted to turn them on and off like that you could not use SON type discharge lights, these require up to 5 minutes or more to reach full light output and wont re strike after switching off for several minutes while they cool down. So instead of using 70w or 150w lamps you would need to use 500w lamps to get the same light output. You can see if would be difficult to save any money unless the road is a very quite one.