Read this thread....multiple members have commented about them including myself.

I still use them. The color spectrum is hit and miss in my experience over the last two years. For example the 20k's I bought in the past were super blue and I just recently purchased some and they are more on the yellow side. But...for the price you can't complain. They grow coral.

http://www.maast.org/showthread.php?...cheap+mh+bulbs