Fluorescent LED DIP 36W w. ballast 18W

number lamps per floor 1 1number of floors per building 1 1number ob buildings 1 1total number of lamps 1 1

power consumption per lamp [W] 46 18total power consumption [kW] 0.05 0.02operating hours per day [h/day] 24 24operating hours per year [h/year] 8,760 8,760annual power consumtion [kWh/year] 403 158

costs per kWh [Baht/kWh] 3.25 3.25annual power cost [Baht/year] 1,310 512

lifetime [h] 15,000 50,000lifetime [Months] 21 68lifetime [years] 1.71 5.71Annual replacement [lamps/year] 0.6 0.2costs per lamp [Baht/lamp] 40 2,200costs per replacement incl. installation [Baht/replacement] 70 2,200

Maintenance

Power Consumption

Energy Cost

ROI calculation of fluorescent T8 tubes versus LED tubes

Break even point LED vs. Fluorescent for 1 lamp

-2,000

-1,000

0

1,000

2,000

3,000

4,000

5,000

0 1 2 3 4 5 6 7 8 9 10 11 12 13

Time [years]

Ssav

ings

[Bah

t]

Payback is 2.5 years