Bamm! resurrecting an old thread!
I was searching through old threads looking for UVB lighting info and I will continue to search after this post ( link to it would save time if you know where one is ). But having worked for a lighting company I can strongly say. " A sodium is a sodium is a sodium" meaning the differences with sodium lights are extremely slim when it comes to spectral output, most of the sodium gimmicks are blown out of proportion with the marketing. example (Hortilux) says " 25% more blue!!" lol and Sunmaster says "10% more lumens!!" lol. These are pretty much the same bulb as a imported china lamp. The difference is in the quality of hardware materials not the spectrum. The better materials used in Hortilux, Ushio, Sunmaster , etc all equate to the life of the lamp and the lumen maintenance ran on high frequency ballasts. We all know in the growing world that means ****, we swap HPS and MH lamps out every year to maintain the 90% lumen maintenance, so I say ya go cheap on sodium lamps but spend some coin on the metal halide lamps. Metal halides are where you see the difference in spectral output with the higher quality salts and hardware.