See the table below for the significant savings to be made by using LED lights. You will see that quite apart from the environmental contribution, it is quite possible to offset the extra cost of purchase with the saving in electricity cost.

Comparisons based on running 160 traditional small-bulb fairy lights or replacing them with 150 indoor LEDs; and 100 large-bulb outdoor Christmas lights replaced with 150 outdoor LEDs. Electricity cost based on an estimated UK average of 10p per unit (kilo-watt per hour), and running the lights for a 6-week period for 12 hours per day. The results show that LED lights are roughly TEN TIMES cheaper than traditional lights to run; see below for actual figures and potential savings.

	Classic small bulb 160	LED indoor 150	Outdoor large bulb 100	LED outdoor 150
Energy Consumption	60.48 kwh	6.95 kwh	151.2 kwh	7.56 kwh
LED percentage saving		88.5%		95%
Cost of electricity	£6.05	£0.70	£15.12	£0.76
MONEY SAVED		£5.35		£14.36

If you require more specific technical information, please see the data below for the power ratings of single LEDs which were used to compile the above table:

Outdoor LED bulb = 0.1w = 0.000435A @ 230V  (A string of 40 LEDs = 4w / 0.017A @ 230V)
Indoor LED bulb = 0.092w = 0.0004A @ 230V (A string of 40 LEDs = 3.68w / 0.016A @ 230V)