10 Pack GU10 4W LED Beautiful Warm White Colour 40w Replacement for Halogen bulb with New Chip Technology with 2 Year Warranty [Energy Class A+]
I paid £31.16 for these in October and considered that decent then.
These are brighter than the 50w units they replaced and gave a good colour of light but Note that they cannot be used with dimmers.
Annual Cost for running 50 watt halogen / 2 hours day / 7 days a week @ 10p per kw
= (50/1000) x £0.10 x 2 x 365 = £3.65
Annual Cost for running 4 watt led bulb / 2 hours day / 7 days a week @ 10p per kw
= (4/1000) x £0.10 x 2 x 365 = £0.29
Saving for 1st year = £3.65 - £0.29 - (£24.84/10) = £0.87
Each year after the first, savings will be £3.36
hope this is helpful to some one