The measure of wattage and lumens in bay lights determines the brightness and concentration of the light spread. Wattage is a measure of the power that the bulb consumes, while lumens measure the amount of light output emitted by the bulb. When choosing bay lights, pay attention to these metrics to ensure proper lighting of your space.
High bay lights typically have a wattage of 150W or above, while low bays more often have wattages between 60W and 100W. Higher wattages draw more power, but provide a stronger, more robust light source.
Low bay lights have fewer lumens because they lose less light in the shorter distance traveled between the fixture and the floor. High bays have higher lumen outputs to compensate for the larger distances they have to cast light over. The typical lumen count for high bays is 15,000 or more, while low bay lights range between 8,000 and 15,000 lumens.
As for beam angles, high bays typically have narrower beam angles, ranging from 50 to 90 to 120 degrees. This is because at a higher ceiling height, the light needs to be more concentrated to reach the full distance to the floor. To do this, high bay lights use special deep reflectors that focus their light downwards and prevent lighting overlap.
Low bay lights have wider beam angles, typically 120 degrees or more. The wider span of light illuminates a larger area of floor space and allows you to use less fixtures in total. Low bay lights have shallower and more diffused lenses that spread and scatter light evenly both downward and outward.
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