1. What is a Recessed Lighting Calculator?

Definition: This calculator determines how many recessed lights are needed to properly illuminate a space based on desired light level (foot-candles), room area, and light output (lumens).

Purpose: It helps homeowners, designers, and electricians plan lighting layouts for optimal illumination.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The total required lumens (FC × Area) is divided by the lumens provided by 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 (common values: 10-20 for living rooms, 30-50 for kitchens), room area in square feet, and lumens per light (default 800lm for standard LED recessed lights).

5. Frequently Asked Questions (FAQ)

Q1: What are typical foot-candle requirements?
A: Living rooms: 10-20fc, Kitchens: 30-50fc, Bathrooms: 70-80fc, Offices: 30-50fc.

Q2: How do I find lumens per light?
A: Check the bulb/luminaire specifications. Standard 6" LED recessed lights typically provide 600-900 lumens.

Q3: Why does the calculator show two numbers?
A: The first is the exact calculation, the second (in parentheses) is the number rounded up to whole lights.

Q4: Should I space lights evenly?
A: Yes, divide ceiling height by 2 for spacing in feet (e.g., 8ft ceiling → lights 4ft apart).

Q5: Does this account for light loss factors?
A: No, consider adding 10-20% more lights for rooms with dark surfaces or high ceilings.