Potential savings on major installations with lights turned off during periods shown Number of fixtures Units Savings Total Savings WEEKENDS & HOLIDAYS 500 1000 2000 5000 $31.92 $31.92 $31.92 $31.92 $15,960.00 $31.920.00 $63,840.00 $159,600.00 12 MIDNIGHT TO 8AM PLUS WEEKENDS & HOLIDAYS 500 1000 2000 5000 $55.44 $55.44 $55.44 $55.44 $27,720.00 $55,440.00 $110,880.00 $277,200.00 6PM TO 8AM PLUS WEEKENDS & HOLIDAYS 500 1000 2000 5000 $72.80 $72.80 $72.80 $72.80 $36,400.00 $72,800.00 $145,600.00 $364,000.00 COST SAVINGS ACHIEVED BY SWITCHING VARIOUS TYPES OF LIGHTS FOR TIMES INDICATED IN COLUMNS 2, 3 & 4 Column 1 - Yearly costs based on 24 hour operation Column 2 - Yearly cost savings with lights off weekends / holidays Column 3 - Yearly cost savings with lights off 12midnight to 8am plus weekends & holidays Column 4 - Yearly cost savings with lights off 6pm to 8am plus weekends & holidays. TYPE OF FITTING 1 . 2 31.23% 3 54.25% 4 71.23% Two lamp 40 watt ord ballast 1200mm x 300mm fluorescent 120.45 37.62 65.34 85.80 Two lamp 40 watt low loss ballast 1200mm x 300mm fluorescent 109.50 34.20 59.40 78.00 Two lamp 36 watt ord ballast 1200mm x 300mm fluorescent 109.50 34.20 59.40 78.00 Two lamp 36 watt low loss ballast 1200mm x 300mm fluorescent 102.20 31.92 55.44 72.80 Four lamp 18 watt low loss ballast 600mm x 600mm fluorescent 102.20 31.92 55.44 72.80 250 watt lamp mercury vapour / metal halide 328.50 102.60 178.20 234.00 400 watt lamp mercury vapour / metal halide 521.95 163.02 283.14 371.80 250 watt lamp high pressure sodium 339.45 106.02 184.14 241.80 400 watt lamp high pressure sodium 536.55 167.58 291.06 382.20 << Back