Ardnamurchan lighthouse and supermarket chillers

 The white spot in the middle of the picture is Ardnamurchan lighthouse seen from the Isle of Eigg. Two close flashes and then a long pause...

I found this claim on the chiller door of a supermarket

This article quotes a power of 72W. 72 Joules per second. The seconds in 26 years are 26 x 60 x 60 x 24 x 365.25 = 820 x 10^6 s. Multiplied by 72, you get 5.91 x 10^10 Joules saved. It is not clear whether this is for one unit of the chiller or not. 5.91 x 10^10 J divided by the number of seconds in a year gives 1.9kW of saving.