Lighting Formula:
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Definition: This calculator estimates the number of low bay LED lights needed based on desired illumination level (foot-candles), area size, and lumens output per fixture.
Purpose: It helps facility managers, electricians, and designers properly illuminate low-ceiling industrial or commercial spaces (typically 12-20 feet high).
The calculator uses the formula:
Where:
Explanation: The total lumens needed (FC × Area) is divided by the lumens provided by each fixture to determine how many lights are required.
Details: Accurate lighting calculations ensure adequate illumination for safety and productivity while avoiding over-lighting that wastes energy.
Tips:
Q1: What's a typical FC value for warehouses?
A: Most warehouses use 15-25 foot-candles for general storage areas.
Q2: How do I find my fixture's lumens?
A: Check the product specifications - common low bay LEDs range from 8,000-15,000 lumens.
Q3: Should I add extra lights?
A: Consider adding 10% more lights for optimal coverage and to account for light loss over time.
Q4: What's the difference between low bay and high bay?
A: Low bay fixtures are for ceilings 12-20 feet, high bay for 20+ feet.
Q5: Does this account for light loss factors?
A: No, for precise calculations, multiply the result by 1.2-1.5 to account for fixture efficiency and room reflectance.