Theses LED banks on the other hand are designed to fit the GU10 fitting used by PAR16 Halogen bulbs, the consist of 20 high power LEDs (Light Emitting Diodes) consuming only 1.8 Watts in total and 2 Watts max. They have a mean time between failure of 30000 hours compared to 3000 hours for Halogens and a very low heat output. They do cost most but do the math and figure out the savings you can make over several years (Find out the cost of electricity in Kilowatt Hours its usually on your bill, and calculate how many hours it would take an appliance to add up to 1 Kwh). They are also available in a variety of colours.
Other things you should know about Halogen bulbs are that you should never touch them as the grease from your fingers shortens their lifespans (It does not tell you this on the box, I wonder why) and when they fail they often trip your MCB (Miniature Circuit Breaker) leaving you in darkness.
Here are the technical data sheets for Halogens.
I cannot seem to find a decent data sheet (Apart from the basic one on the Farnell website) for the LED bulbs but each super bright LED is equivalent to 200 candles now multiply that by 20 and the total light from each bulb should amount to the equivalent of about 4000 candles.
There are many suppliers of these devices but I find the best place is Farnell as they are international and provide very fast service and great technical feedback.