Savings

The following shows the kind of savings that can be made by changing just 10 Halogen downlighters to LED. The figures are based on typical shop opening hours of 10 hours per day, Monday - Saturday all year, a total of 312 days.

 A LED bulb uses 15.6kw per year compared to Halogen using 156kw per year.

If your lights are on longer that means quicker payback!

 If you have more than 10 lights that means the savings are greater!

 If the cost of electricity goes up (which it will) that means quicker payback and greater savings.

	Halogen	LED
(a) No. of Lamps	10	10
(b) Wattage per Lamp	0.05	0.005	Bitmap
(c No. of hours use per year (days x hrs)	3120	3120
(d) kw used per year                (a) x (b) x (c)	1560	156
(e) Energy Cost per year @ 12p/kw  (d)x12p	£187	£19
(f) Lifespan of Lamps	2000	50000
(g) Energy costs per 50000hrs @ 12p/kw          (a x b x 20000 x 12p)	£3,000	£300.00	The Sustainable Lighting co.
(h) No. of replacement lamps per year @ 10 hrs p/day            (c)x(a)/(f)	15.60	0.62	Circuit Designation: Washrooms
(i) Cost of replacement per lamp (inc labour + materials)	£5	£20	Action taken : Convert 10 x 50 watt Halogens to 5 watt LEDs
(j) Maintenance cost per year (h) x (i)	£78	£12
(k) Maintenance cost per lamp life (a)x(i)x50000/(f)	£1,250	£200
Total potential savings per year (e1-e2)+(j1-j2)	£234
Total potential savings per LED lifespan                      (g1-g2)+(k1-k2)	£3,750
kg of CO2 emissions prevented per year	702	kg
kg of CO2 emissions prevented per installation lifespan	11,250	kg
That's equivalent to driving a 130g CO2/km car for
	86538	km