1. What is a Recessed Lighting Calculator?

Definition: This calculator determines the number of recessed lights needed to properly illuminate a room based on desired light level, room size, and light output.

Purpose: Helps homeowners and designers create optimal lighting layouts that provide adequate illumination without over-lighting.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( FC \) — Required foot-candles (illuminance 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 visual comfort, task performance, and energy efficiency. Too few lights create dark spots, while too many waste energy.

4. Using the Calculator

Tips:

• Typical FC values: 10-20 for living rooms, 30-50 for kitchens, 70-100 for task lighting
• Measure room length × width for area
• Check lumens rating on light packaging (typically 600-1200 lm for recessed lights)

5. Frequently Asked Questions (FAQ)

Q1: What's a foot-candle (FC)?
A: A unit of illuminance equal to one lumen per square foot. Measures how much light reaches a surface.

Q2: Why does the calculator round up?
A: You can't install a fraction of a light fixture, so we round up to ensure adequate lighting.

Q3: How do I space the lights?
A: Divide ceiling height by 2 for spacing between lights. For 8ft ceilings, space lights 4ft apart.

Q4: What if I want dimmable lights?
A: Calculate for maximum brightness needed, then install dimmer switches for flexibility.

Q5: Does this account for light color (Kelvin)?
A: No, this calculates quantity only. Choose 2700K-3000K for warm light, 3500K-4100K for neutral, 5000K+ for cool daylight.