15 amp light switch of a standard single pole is rated for 1800 Watts of power. Also, you can get a 20 amp light switch which allows for more wattage. You should not surpass 1500 watts of lightning on a single pole light switch. This equalizes to 80% of the circuit load. If you need a huge load or multiple circuits then a lightning relay should be used. It is used to power multiple circuits straight from your power source with a signal from the light switch. Such type of light switch is used in large commercial premises or buildings where several lights are required to turn on at the same time.