That $15 light you bought at RadioShack is probably total crap and not good for the plantys. I got my first growlight from HTG supply for $80 shipping included. It is a mini-compact 150w HPS with the ballast contained inside the reflector. These things are super-versatile and user-friendly. You can put it within 3 inches of the plant tops without burning them. I used a couple daylight cfls for the lower branches. I produced 4ounces of high-quality Ganj. I have since found this same lamp at VMInnovations.com for the super-low price of 2 for $115 with free shipping. However, I bought an inline fan from them for about 60% the cost of the other stores and while it is a top-quality fan, it arrived in its original packaging with a mailing label stuck on it. NOT very discreet. I'm glad it was not a grow-light as MJ cultivation remains illegal in my state (until Jan. 1st 2014 (wootwoot)). I do not know if they offer discreet shipping for a little extra $. Great Luck with your grow!