Here is an inexpensive Clamp Light for Indoor Plant Growing ($6 at Menard's):
Bayco SL-300N4 8.5 Inch Clamp Light with Aluminum Reflector
This Clamp Light with Aluminum Reflector has an ON/OFF switch and is rated for up to a 150-watt incandescent bulb. I use daylight CFLs (18W/75W).
For positioning, it has an adjustable ball joint and a spring steel clamp with vinyl sleeve.
8 1/2" Deluxe Clamp Light at Menards http://bit.ly/YdEfeI
Bayco 150-Watt Incandescent Clamp Light - Walmart.com http://bit.ly/YdEbff
Bayco SL-300N4 8.5 Inch Clamp Light with Aluminum Reflector - Amazon.com http://amzn.to/YdE4QN
Bayco 150-Watt Incandescent Clamp Light-CE-300PDQ at The Home Depot http://thd.co/YdEc2O