well, i don't think you can find hps of 25 watts and Mh of 50 watts......i wish i could find some lights of this output but i don't think they exist......ok for HPS there are the following:70,150,250,400,600&1000 watters......for MH:250&400.....as for where you can get them go to your countrys' top net search engine and do some research using for keywords:HPS,MH,lights,buy online (in your native language)