Home
Back
Lumens Formula:
| From: | To: |
The lumens calculation determines the total amount of visible light (lumens) required to properly illuminate a room based on its area and the desired lighting level (footcandles). This helps in selecting appropriate lighting fixtures for optimal illumination.
The calculator uses the lumens formula:
Where:
Explanation: The formula calculates the total lumens needed by multiplying the room area by the recommended footcandle level for that type of space.
Details: Proper lighting calculation ensures adequate illumination for tasks, enhances visual comfort, improves safety, and creates the desired ambiance while optimizing energy efficiency.
Tips: Enter room area in square feet and the recommended footcandle level. Common footcandle recommendations: living rooms (10-20), kitchens (30-40), offices (30-50), reading areas (50-75). All values must be positive numbers.
Q1: What are footcandles and how do I choose the right value?
A: Footcandles measure illuminance (light falling on a surface). Choose based on room function: general lighting (10-20), task lighting (30-75), detailed work (75-100+).
Q2: How do I convert room dimensions to square feet?
A: Multiply length by width in feet. For irregular rooms, divide into rectangles and sum the areas.
Q3: What's the difference between lumens and watts?
A: Lumens measure light output (brightness), watts measure energy consumption. Modern LED lights produce more lumens per watt than traditional bulbs.
Q4: Should I consider room color and reflectivity?
A: Yes, dark colors absorb light (may need 10-20% more lumens), light colors reflect light (may need fewer lumens). Consider window placement and natural light.
Q5: How do I distribute multiple light sources?
A: Divide total lumens among multiple fixtures for even illumination. Consider layered lighting: ambient (general), task (specific areas), accent (decorative).