To answer your question you can get Ecopal in Eurosales.
Yes they are not as bright as 50w halogens lights. The way we look at it is if you plan x10 50w lights in a room, up the number to x14 of the 2w Ecopal. You are only using 28w of electricity as opposed to 500w.
By balancing the number of lights you will not notice any major fall off on the light levels. They are not super white coloured light, they are slightly warmer.
Last purchase was €8-9 + vat per lamp.