If you run 115VAC lines, consider using them to power an "always on" (no photocell) LED night light so you won't have to change the bulb.
If you're knowledgeable enough, you could connect the output side of the pump switch to a cheap AC cell phone charger (wall transformer) close to the switch, and then run low voltage wire (cheap doorbell wire) into your house and use it to power an LED.
Most newer cell phone AC "chargers" will take any voltage from 110 through 240 VAC as their input and still have the same 5VDC output voltage. The input and output voltages should be written on the transformer.
The cheap $2 LED flashlights sold as impulse items near cash registers use three AAA batteries wired in series for about 4.8VDC, so the output voltage of a cell phone "charger" can be wired to the battery terminals of such a flashlight. You might need to break off some of the LED's so it isn't annoyingly bright. The LED's are wired in parallel, so breaking some of them off should not cause any problem. After breaking off the plastic, if the metal stubs are still sticking up, clip them off or at least make sure they don't touch each other.
Also, when connecting the wires to the flashlight, polarity matters. If it doesn't work one way, try reversing them. No damage is done by connecting them backward.