[Amps] Amp causing RFI

[Gary Hendricks]

I have a Tentec Hercules II amplifier. When I am on 40 meters only it
sets off my neighbors outside motion light. I know these lights are a
problem, but what has me concerned is when I run my old SB-230 at the
same power level his light does not come on.
Do you think this indicates some purity issues with the Tentec amp?
Maybe something in the VHF range?
I wonder if an old fashioned low pass filter might help. Any ideas?
Gary K4MT