1. What is a Number of Can Lights Calculator?

Definition: This calculator determines how many recessed can lights are needed to properly illuminate a space based on desired light level, room area, and light output.

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:

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

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

3. Importance of Proper Lighting Calculation

Details: Correct lighting ensures adequate illumination for tasks, enhances room aesthetics, and improves energy efficiency by preventing over-lighting.

4. Using the Calculator

Tips: Enter desired foot-candles (default 30 for general lighting), room area in square feet, and lumens per light (default 800 for typical LED recessed lights).

5. Frequently Asked Questions (FAQ)

Q1: What are typical foot-candle requirements?
A: General lighting: 20-30 fc, Kitchens: 30-40 fc, Task lighting: 50-75 fc, Retail displays: 100+ fc.

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

Q3: Why does the calculator round up?
A: Lights must be whole numbers, and it's better to have slightly more light than not enough.

Q4: Does this account for light loss factors?
A: No, consider multiplying the result by 1.2-1.5 to account for light loss due to fixture type, ceiling height, and room colors.

Q5: How should I space the lights?
A: Divide ceiling height by 2 for spacing in feet (e.g., 8 ft ceiling → lights 4 ft apart).