Larisa Ariadna. lighting. December 24th , 2016.
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A standard incandescent 15W light bulb generates 122 lumens, or 8 lm/W. A CFL (compact fluorescent light) bulb of almost the same lumen capacity (125 lm) requires only 3 watts of energy, producing 42 lm/W. A metal halide light bulb is even more energy efficient, with some halide bulbs generating as much as 115 lm/W. Light bulb energy usage is imperative when considering how much illuminance is required for a room versus how many lighting fixtures are possible. Furthermore, as wattage is increased, so is electrical resistance, as illustrated by the Ohm's Law derivation R= P/I2 (where R= resistance (Ohms), P= power (Watts), and I= current (amperes)). When calculating the amount of lighting required for very large rooms, therefore, or rooms with high ceilings, these basic physical laws must be accounted for.
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When choosing a lampshade, it's generally best to select one that has soft curves instead of sharp angles. Angular lampshades are more likely to create an uneven distribution of light, thus increasing the possibility of shadows. Sharp edges of any kind can also be detrimental to the flow of positive energy within a room.
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