To answer this question a voltage needs to be stated. W = Amps x Volts to find total circuit wattage. Then divide the bulb wattage into total circuit watts.
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Common sense with electrical systems dictates that current in a circuit be limited to 80% of nameplate (20A). The number of 150W lamps will be limited to 12 in this scenario. This answer can be superseded by local ordinance.
A 15 amp circuit can handle approximately 8-10 60 watt bulbs. Each 60 watt bulb draws 0.5 amps of current, so you divide the circuit's amp rating (15 amps) by the current draw per bulb (0.5 amps) to get the approximate number of bulbs it can handle.
1 amp
For a 1500 watt hot water heater connected to a 110 volt power source, you would need a 13.6 amp circuit. It is recommended to use a 15 amp circuit to provide some safety margin.
It is generally recommended to have a maximum of 12 outlets/lights on a 15 amp circuit breaker. With each 100 watt light consuming 0.83 amps, you could safely have around 18 lights on the circuit. It's always best to consult a licensed electrician to ensure safety and compliance with local regulations.
You can safely connect up to 10 70-watt lights on a 15 amp circuit. Each 70-watt light draws 0.58 amps, so you would not exceed the circuit's 15 amp capacity with 10 lights.