1. What is the Recessed Lighting Calculator?

The Recessed Lighting Calculator helps determine the number of light fixtures needed to properly illuminate a space based on area size, desired illumination level, and fixture brightness.

2. How Does the Calculator Work?

The calculator uses the recessed lighting formula:

Where:

• \( \text{Sq ft} \) — Area to be illuminated in square feet
• \( \text{Footcandles} \) — Desired illumination level (typical values: 10-50 fc for residential, 50-100 fc for commercial)
• \( 1.1 \) — Factor accounting for light loss
• \( \text{Lumens per Fixture} \) — Brightness of each light fixture

Explanation: The equation calculates how many fixtures are needed to achieve the desired light level in a given space.

3. Importance of Proper Lighting Calculation

Details: Proper lighting calculation ensures adequate illumination for the space's purpose while avoiding energy waste from over-lighting or insufficient lighting that causes eye strain.

4. Using the Calculator

Tips: Measure your space accurately in square feet. Determine appropriate footcandle levels for your application (residential, office, retail, etc.). Check lumens rating of your chosen fixtures.

5. Frequently Asked Questions (FAQ)

Q1: What are typical footcandle recommendations?
A: Living rooms: 10-20 fc, Kitchens: 30-40 fc, Offices: 50-75 fc, Retail: 50-100 fc, Task lighting: 75-100 fc.

Q2: How do I find lumens per fixture?
A: Check the product specifications. Typical recessed lights range from 600-1200 lumens for LED fixtures.

Q3: Why the 1.1 multiplier?
A: This accounts for light loss due to fixture efficiency, room surface reflectivity, and light depreciation over time.

Q4: Should I round up or down?
A: Generally round up to ensure adequate lighting, but consider fixture placement and room layout.

Q5: Does ceiling height matter?
A: This simplified calculation assumes standard 8-10 ft ceilings. For higher ceilings, you may need more fixtures or higher lumen output.