Light comparator circuit idea

[nkuck]

I am looking for an idea to use a bridge circuit to produce an output level to a 150W lamp in relation to the ambient level. Essentially, the 150W lamp output would be compared with, and adjusted to, the ambient level, simulating the actual outdoor light level.

 

[IRQ57]

Light Control

Hi Nkuck,

Just as an idea: As you said, using a bridge with two LDRs, one in each branch, it is possible to compare the voltage difference in a Op Amp and the output compared with a ramp synchronized with the AC supply. The resulting rectangular pulse is fed to a MOC and this fires a triac.

The real circuit is not complex and requires a general Op Amp (LM324), a bridge rectifier 1A, a 555, a MOC 3023, a simple diode, 3 transistors 2n3906, 2 LDRs, a triac, and a bunch of resistors and capacitors.

Good luck