When you want to build temple light circuit model easiness. I begs for to advise this Bargraph Light Meter circuit , It uses pillar equipment be IC 741 or IC op-amp the highly popular. By this circuit will show with LED 4 amounts are level. And have poto transistor be the equipment detects the light. Besides you still can fine R3 for control the rapidity has of the circuit with.
Bargraph Light Meter by IC 741
Q1 is Photo Transistor,
R3 : Offset Adjust,
LED Display 3 LED.
