Quote Originally Posted by olstyn View Post
Sure, but not everybody can afford a Helix or a Herpstat at $110+, and plenty of people get by just fine without them by either using lamp dimmers to clamp the max output to a safe level or just closely monitoring the temps in the enclosure.
There are some inexpensive but adequate thermostats out there for people who cant afford $100+. Hydrofarm makes a good one. Here is a link:

http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S