1. What is a Recessed Lights Calculator?

Definition: This calculator estimates the number of recessed lights needed based on desired illumination level (foot-candles), room area, and light output (lumens).

Purpose: It helps homeowners, electricians, and designers determine how many recessed lights are required for proper room illumination.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( FC \) — Desired illumination level (foot-candles)
• \( \text{Area} \) — Room area (square feet)
• \( \text{Lumens per Light} \) — Light output of each fixture (lumens)

Explanation: The total required lumens (FC × Area) is divided by the lumens output of each light to determine how many fixtures are needed.

3. Importance of Proper Lighting Calculation

Details: Correct lighting ensures adequate illumination for tasks, creates desired ambiance, and prevents energy waste from over-lighting.

4. Using the Calculator

Tips: Enter the desired foot-candles (10-20 for living rooms, 30-50 for kitchens), room area in square feet, and lumens per light (typically 600-1200 for recessed lights). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical FC values for different rooms?
A: Living rooms: 10-20 fc, Kitchens: 30-50 fc, Bathrooms: 70-80 fc, Offices: 30-50 fc.

Q2: How do I find lumens per light?
A: Check the bulb packaging or manufacturer specifications. LED recessed lights typically range from 600-1200 lumens.

Q3: Should I round up the result?
A: Yes, always round up to the nearest whole number since you can't install a fraction of a light.

Q4: Does this account for light loss or room reflectance?
A: No, consider multiplying the result by 1.2-1.5 for light loss factors and room conditions.

Q5: How does ceiling height affect this calculation?
A: Higher ceilings may require more lights or higher lumen output to achieve the same FC at floor level.