With the development of LED technology and constant increase LED lighting efficiency, we also increased our actual specific output of our LED lamps. Currently used LEDs CREE XM-L2, the highest light categories U2, U3 have enabled us to achieve (after deducting losses on optics, sources, etc ...) luminous efficacy of up to 138lm/W. By the solar LED lamps we are reaching 150lm/W. Current market average by LED lighting does not reach even 100lm/W. Are you planning to buy LED lights? Choose indeed economically and efficiently, because only those will guarantee a fast return on your investment.