A fish wholesaler on the dock estate was running 400 W metal halide high-bay lamps across a 2,000 square metre warehouse and cold store. The lighting was dim where lamps had failed, took minutes to warm up after a power cut and cost more to run than they liked.
We replaced the 140 fittings with 150 W LED high bays, swapping them aisle by aisle during the afternoon lull between the morning despatch and the evening deliveries. The cold store fittings are rated for the low temperature and the wash-down areas got IP65 fittings. We added occupancy sensors to the racking aisles and daylight dimming near the loading doors. Two of the team were on site for three weeks, and the forklifts never stopped.
The lighting load fell from about 60 kW to under 22 kW. The owner's electricity bill dropped by roughly a third in the first quarter, and the warmer light made the quality checks on the packing line easier.