double powered sodium lamp: this sodium lamp can be 250w and 150w as your setting, for example it can be 250w from 18:00 to 22:00, then change automatically to 150w from 22:00 to 6:00 as you fixed time, thus save energy 50%. Most of our products are widely used in the most important projects in China such as Shanghai Pudong Air Port, The Oriental TV Tower and NanPu bridge and so on. And also we are exporting to world wide such as USA, Europe and Japan and singapore, we have set up our names for good quality and best services. Welcome all kinds of cooperation to develope together. Tel/fax:0086-21-66166055 or 66162340