1. What is an Outdoor Tree Light Calculator?

Definition: This calculator estimates the total lumens needed to properly illuminate outdoor trees based on coverage area and desired light intensity.

Purpose: Helps landscape designers, homeowners, and lighting professionals determine appropriate lighting for tree displays.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Lumens} \) — Total light output needed (lm)
• \( \text{FC} \) — Desired illumination level (foot-candles, fc)
• \( \text{Area} \) — Tree coverage area (square feet, ft²)

Explanation: The desired illumination level is multiplied by the area to be covered to determine total lumens required.

3. Importance of Proper Tree Lighting

Details: Correct lighting enhances tree features, provides safety illumination, and creates desired ambiance while minimizing light pollution.

4. Using the Calculator

Tips: Enter the desired illumination level (default 5 fc) and the tree's coverage area in square feet. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical illumination level for trees?
A: Most trees require 5-10 fc for accent lighting, 10-20 fc for feature lighting, and 2-5 fc for subtle moonlighting effects.

Q2: How do I measure tree coverage area?
A: Estimate the area the tree covers (canopy diameter × canopy diameter) or use the shadow area at noon.

Q3: Should I consider tree height in calculations?
A: Height affects light spread but not total lumens needed. Use spotlights for tall trees to focus light upward.

Q4: How many fixtures does this translate to?
A: Divide total lumens by your fixture's output (e.g., 20,000 lm total ÷ 1,000 lm/fixture = 20 fixtures).

Q5: Does this account for light loss?
A: No, consider adding 20-30% more lumens for factors like fixture aging, dirt accumulation, and light absorption.