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Lumens Formula:
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The lumens calculation determines the total luminous flux needed for a room based on its area and the required illumination level measured in footcandles. This helps in proper lighting design and fixture selection for various spaces.
The calculator uses the lumens formula:
Where:
Explanation: The formula calculates the total lumens required by multiplying the room area by the desired illumination level in footcandles.
Details: Proper lumens calculation ensures adequate lighting for different room types and activities, prevents over-lighting or under-lighting, and helps in energy-efficient lighting design.
Tips: Enter room area in square feet and the required footcandles based on room type and activities. Common footcandle recommendations: living rooms (10-20), kitchens (30-40), offices (30-50), reading areas (50-75).
Q1: What are footcandles?
A: Footcandles measure illuminance - the amount of light falling on a surface. One footcandle equals one lumen per square foot.
Q2: How do I determine the right footcandles for my room?
A: Consider room function: general lighting (10-20 fc), task lighting (30-50 fc), detailed work (50-100 fc). Refer to lighting standards for specific applications.
Q3: What's the difference between lumens and watts?
A: Lumens measure light output (brightness), while watts measure energy consumption. Modern LED lights produce more lumens per watt than traditional bulbs.
Q4: Can I use this for outdoor lighting?
A: Yes, but outdoor requirements differ. Security lighting may need 2-5 fc, while sports lighting can require 30-100 fc depending on the activity.
Q5: How do I convert the result to number of light fixtures?
A: Divide total lumens by the lumen output per fixture. For example, if you need 5000 lumens and each fixture provides 800 lumens, you'll need approximately 7 fixtures.