Bob, if all the lights are affected, it would more than likely be an issue with the pump or its wiring. unlikely that all of the lights would have bad grounding. Making sure that all connections to the pump are tight, and the correct size wire (when in doubt go one size bigger). Make sure if crimp and or spade terminals are used they are securely crimped. LED lamps are fairly sensitive to voltage change, and a slight drop in voltage from the pump coming on can cause them to pulse.
Motors inherently produce a magnetic field, this can cause interference on radios, and sensitive electronics. since incandescent lamps are a simple resistance load they are very resistant to interference, LED lamps are actually diodes,(some LED fixtures have a built in filter, some do not) and will more easily be affected by motors. florescent are somewhere in the middle. If checking and upgrading the pump wire does not fix it, you could try a capacitor across the input wires at the pump, this will work as a small battery of sorts to absorb some of the interference. you can also find Ferrite EMI Suppression cores online for a couple of bucks, these just snap in place around the power wires, you will see them on computer cords, and some power tools.
Good luck.
Dave
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