Cheap, easy, galvanic isolated and powerful 230VAC dimmer controlled by PWM output from Arduino, Raspberry Pi etc.
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Step 1: How Does It Work
Buy cheap AC dimmer on eBay, which is controllable by manual adjustable resistor. http://www.ebay.com/itm/4000W-AC-220V-SCR-Voltage-...
Connect parallel to manual adjustable resistor photoresistor, place photoresistor to dark box together with LED.
Control LED light by PWM output.
Step 2: What Do You Need
- AC dimmer http://www.ebay.com/itm/4000W-AC-220V-SCR-Voltage-...
- Photoresistor eg VT431N http://www.promelec.ru/pdf/DTS_vt400.pdf
- LED (white)
- resistor (approx 20kOhm)