Case study · Warehouse
From 7.5 to 72.5 foot-candles
A warehouse replaced 408 400W metal halide fixtures with 300 six-lamp T5 high bays, cutting the load by about half and raising light levels from 7.5 to 72.5 foot-candles.
The job
This warehouse called us about its lighting problems. After touring the building, we replaced 408 fixtures of 400W metal halide (480 watts each with the ballast) with six-lamp 54W T5 high bays at 324 watts each.
Because the new high bays put out more usable light, 300 of them did the job of the old 408. Dropping those 108 fixtures saved another 51,840 watts on top of the per-fixture savings.
Before the retrofit the floor averaged 7.5 foot-candles. After, it averaged 72.5 foot-candles, which was critical for stopping the picking and shipping mistakes that low light was causing.
Before
408 × 480W system
400W metal halide
7.5 fc average
After
300 × 324W
6-lamp 54W T5 high bay
72.5 fc average
- Fixtures
- 408 → 300
- Load (calc)
- 195.8 → 97.2 kW
- Light level
- 7.5 → 72.5 fc
- Load cut (calc)
- ~50%
"calc" figures are worked out from the job's fixture counts and watts.
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