How to Make Automatic Bulb Switch Using LDR

Light/Dark Activated Switch circuit without Relay The Working Principle of this Automatic Bulb Switch same as My previous Project Automatic Transformerless Light Switch.  But Here Used A Triac At the place of Relay. In the circuit, There is no used Relay for switching.  This is Automatic Light Controlled Bulb Switch With LDR Using Without Relay  When