1. What is a Lux to PAR Calculator?

Definition: This calculator converts illuminance (lux) to Photosynthetically Active Radiation (PAR) using a conversion factor.

Purpose: It helps horticulturists, indoor gardeners, and researchers estimate PAR values from standard light measurements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( PAR \) — Photosynthetically Active Radiation (μmol/m²/s)
• \( Lux \) — Illuminance (lux)
• \( CF \) — Conversion Factor (typically ~0.0185 for white light)

Explanation: The lux value is multiplied by a conversion factor specific to the light source to estimate PAR.

3. Importance of PAR Measurement

Details: PAR is crucial for plant growth as it measures the light spectrum (400-700nm) that plants use for photosynthesis.

4. Using the Calculator

Tips: Enter the lux measurement and appropriate conversion factor (default 0.0185 for white light). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor important?
A: Different light sources have different spectral distributions, affecting how much lux converts to usable PAR for plants.

Q2: What's a typical conversion factor?
A: For white light (full spectrum), ~0.0185 is common. For red/blue LED grow lights, it may be higher (~0.02-0.025).

Q3: How accurate is this conversion?
A: It provides an estimate. For precise measurements, use a dedicated PAR meter.

Q4: What lux values are good for plants?
A: Most plants need 10,000-50,000 lux, equivalent to ~185-925 μmol/m²/s PAR (with default conversion).

Q5: Can I use this for sunlight?
A: Yes, but sunlight's conversion factor may vary slightly (~0.019) due to atmospheric conditions.