The lamp fittings were
replaced by T5 type using electronic ballasts. The rated power for
each T5 lamp was 28W and every electronic ballast consumed
5 W. Without changing the type, number and layout of the luminaries,
the total lighting load was measured and computed to be
2640 W, representing a power density of 16 W/m2. The light fitting
replacement decreased the power rating of 1040 W, accounting for
a 28% reduction.