These led spotlights typically use around 92% less energy compared to a standard 50w halogen bulb with incredible energy savings:- For every 10 LED bulbs in a domestic application could reduce your electricity bill by £85 per year. For every 10 LED bulbs in a commercial shop/ office/ restaurant could save you an amazing £250 per year off your electric bill (Above calculations based on a typical 13p per KWH electricity cost, lights on 4 hours per day in a domestic application, lights on 9-11 hours per day in a commercial application). The above savings mean the cost of the LED lights will be paid back through electricity bill savings in only 7 months for domestic and just 11 weeks for commercial property therefore don't but put off the the upfront cost of LED Lights - They will quickly start to save you money. LED bulbs have instant brightness as soon as they are switched on and do not have a warm up time. All of our products are genuine and approved. They comply with European electrical regulations with CE approval and RoHS Compliant. Please note that the lumen brightness of the bulb varies depending on the distance from the bulb and the control of light entering the test area. You will see varying lumen figures on other websites for very similar products. The products we sell are the brightest available for each light bulb design. Note: Calculations are approximate guidance but savings will be similar to those shown. Figures based on 90% energy saving by converting to 5W LED energy saving lights. Purchase & shipping costs excluded.