1. What is a Recessed Lights Calculator?

Definition: This calculator estimates the number of recessed lights needed based on desired illuminance, room area, and light output.

Purpose: It helps homeowners and lighting 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 illuminance in foot-candles (measure of light intensity)
• \( \text{Area} \) — Room area in square feet
• \( \text{Lumens per Light} \) — Light output of each recessed fixture

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

3. Importance of Proper Lighting Calculation

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

4. Using the Calculator

Tips: Enter desired illuminance (default 30 fc for general rooms), room area in sq ft, and lumens per light (default 800 lm). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical FC value for different rooms?
A: Living rooms: 10-20 fc, Kitchens: 30-40 fc, Bathrooms: 70-80 fc, Offices: 30-50 fc.

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

Q3: Should I round up or down the result?
A: Always round up to ensure adequate lighting. Our calculator does this automatically.

Q4: Does this account for light color (CCT)?
A: No, this calculates quantity only. Choose 2700K-3000K for warm light, 3500K-4100K for neutral, 5000K+ for cool daylight.

Q5: How should I space the lights?
A: As a rule of thumb, space lights equal to half the ceiling height (e.g., 8 ft ceiling → 4 ft spacing).