Why does my porch light dim when the motion sensor trips? (lighting, electrical)

[djxpress]

This is how it's wired in my backyard. I have a switch inside my house that turns on the porch light. When the motion sensor trips the flood light, the flood light turns on. Then after a few seconds the porch light dims. Then when I trip the motion sensor again (I can see a little red dot go off in the motion sensor), the porch light gets brighter again. Anybody know if this is due to the way it's wired (possibly in series?)?

[K'ledgeBldr]

Lighting wiring is straightforward- hot, neutral, ground.
What you’re experiencing is a power draw of the flood lights from the porch light- and whatever else is on that circuit.

Nothing really to worry about- but you may want to consider LED bulbs for both fixtures.

[djxpress]

Both lights are LED. I think that may be the problem since I've noticed LED are super sensitive to the smallest change in electrical current. I bought a CFL bulb for the porch light to see if that may fix the problem.

[harry chickpea]

Yep, the circuitry in the LED that is dimming is the problem (unless the circuit is on a dimmer). I have an LED shop light that has a fit whenever I use a clothes iron, and my GF has a chandelier using LEDs that will strobe unless one of the lights in the circuit is an incandescent. Not sure if the use of a CFL will fix it, a LED porch light rated for use with dimmers MAY fix it, an incandescent will be fine.