The following circuit is a lamp dimmer circuit that is capable of controlling up to 1200 Watts. The circuit uses the Q4015LT combination Diac and Triac.
http://home.cogeco.ca/~rpaisley4/x1200WControl.html
This circuit is used to fade a pair of red LEDs. In this version, the lamps are faded by varying the duty cycle so that higher power incandescent lamps can be used without much power loss.
http://ourworld.compuserve.com/homepages/Bill_Bowden/page6.htm#eyes2.gif
It uses 0-10V control signal
http://www.vego.nl/3/6/3/3_6_3.htm
http://www.techlib.com/electronics/power_control.htm
http://www.neonshop.com/neonweb/nn/dimmer2.gif
http://www.call-n-deal.de/uwe/projekte/stagelightning/pp785/
change the brightness of lamp, with a only key of touch. This circuit is based on S566B IC from SIEMENS
http://users.otenet.gr/~athsam/touch_dimmer.htm
900W maximum per channel, 2300W maximum total, operates at 230V 50Hz mains supply, uses standard 0-10V analogue control signal
http://www.tkk.fi/Misc/Electronics/circuits/dimmer4.html
uses PIC16F84 to control 20 watt 12V DC halogen lamp
http://www.geocities.com/sunsetstrip/concert/2301/dimmer.html
http://www.uoguelph.ca/~antoon/circ/lantern.htm