I want to use the top of a solar garden light as a moon light in my 55 gallon aquarium.will i have to keep replacing the batteries in it or will it make energy from the lights in my home?
Yes, but not nearly as much. Your plan may be quite satisfactory, since you probably want the light for only a few hours rather than all night. A good solution is to move the lamp into the sunlight every morning and return it to your aquarium when you want the moonlight effect. You’ll probably need to cover up the solar cell at that time. It will probably detect enough ambient light so it doesn’t power up the LED, but not enough to charge the battery.