When working with LED lighting, particularly when those LEDs are part of a battery-powered project, it may be important to calculate the power use of your LEDs in the circuit. This is a simple task with a multi-meter capable of measuring current, resistance and voltage, but if you lack one, it is possible to estimate the LED's power use by consulting the packaging and manufacturer's sheets that came with the LEDs. You only need to find the current and the voltage of your LEDs. Calculating the power use of LED lighting is a critical step for any battery-powered electronics project, and thankfully it is simple to do.
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The National Electrical Code does not specify the maximum number of recessed lights that may be supplied by a amp circuit breaker. The code does rate lighting as either a continuous duty or noncontinuous duty load, and does limit a circuit breaker's load to 85 percent of its rating for continuous duty loads. Those two rules allow you to calculate the maximum number of light fixtures based on their wattage. The NEC defines a continuous duty load as any load expected to draw current continuously for a period of three hours or more. Since most lights are used nonstop for three hours or more, they fall under the continuous duty rules.
hooking lights up to amp?
Recessed lighting canisters provide attractive ambient lighting, but because the fixtures are hidden behind the ceiling, you need more than one to adequate illuminate a room. The optimum number of fixtures for a particular space depends on a number of factors, including bulb wattage, canister width, and room shape and dimensions. The number of lights you can put on a circuit is limited by the breaker rating, but in most cases, that isn't an issue. The ideal spacing of recessed lighting fixtures results in each part of the floor having approximately equal illumination.
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