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EVO-20 DLI METER

Know How Much Light Your Plants Actually Receive

Measure Daily Light Integral instead of relying on a single momentary light reading. EVO-20 automatically tracks the total light your plants receive throughout the day.

✓ No setup — place it where your plants grow.
✓ Automatically measures accumulated daily light.
✓ Stores up to 10 days of DLI history.
✓ Works under sunlight and common grow lights.
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Designed for gardens, patios, greenhouses and indoor growing areas.
EVO-20 Daily Light Integral DLI Meter
DLI Measurement
Total daily plant light
Auto Start
No complicated setup
10-Day History
Compare changing conditions
Sun + Grow Lights
Indoor and outdoor use

A Single PAR Reading Doesn't Tell the Whole Story

Plant light exposure changes continuously as the sun moves, clouds pass, shade changes and grow lights turn on or off. DLI looks at the accumulated light over time.

Daily Light Integral is calculated from PAR over time

Light Changes Throughout the Day

DLI combines changing PAR levels over time into one daily value, giving you a clearer picture of the light available to your plants.

EVO-20 DLI meter compared with a single phone PAR reading

DLI > One Instant Reading

A PAR measurement shows what is happening now. DLI shows the cumulative light received throughout the day.

Understand the Number That Matters Over a Full Day

PAR describes photosynthetically active radiation. DLI describes the accumulated quantity of that light delivered over time.

Explanation of PAR and Daily Light Integral DLI
Place EVO-20 DLI meter in the growing location

Place It. Leave It. Check the Result.

1

Place EVO-20 Near Your Plant

Position the meter where you want to understand the plant's actual daily light exposure.

2

Let It Measure Automatically

No phone pairing, complicated menus or repeated spot measurements are needed for normal operation.

3

Read the Daily Light Result

Check the DLI value and use the simple light-category indicators to understand the growing location.

4

Compare Different Days

Review historical readings to see how changing weather, seasons or placement affect daily light.

Don't Judge a Growing Spot by One Day

Sunlight can vary substantially from day to day. EVO-20 stores up to 10 days of DLI history so you can review changing light conditions instead of relying on one measurement.

✓ Up to 10 days of DLI history
✓ Compare sunny and cloudy days
✓ Evaluate different plant locations
✓ Understand seasonal light changes
EVO-20 stores up to 10 days of DLI history
EVO-20 Full Sun Partial Sun Partial Shade and Shade classification

Turn Light Data Into an Easy-to-Understand Growing Condition

EVO-20 combines the DLI value with simple visual indicators, helping you recognize whether a location behaves more like full sun, partial sun, partial shade or shade.

Full Sun High daily light exposure
Partial Sun Moderate-to-high daily light
Partial Shade Moderate daily light exposure
Shade Lower daily light exposure

From the Backyard to the Grow Room

Use EVO-20 to evaluate daily plant light under natural sunlight or common horticultural grow-light environments.

EVO-20 measures DLI under sunlight and common grow lights
EVO-20 DLI meter used outdoors

Built for Real Growing Conditions

Plants stay outside when it rains — your light measurements need to reflect the same real environment. EVO-20 is designed for normal outdoor garden use and ordinary exposure to rain or watering spray.

Leave it in the growing location and measure where the plant actually receives its light.

Intended for ordinary outdoor exposure and water spray. Do not intentionally submerge the meter in water.
Product Support

EVO-20 User Manual

View the EVO-20 user manual for setup, operation, display information and product-use instructions. The manual is provided as a PDF and can be viewed online or downloaded to your device.

Download User Manual (PDF)

EVO-20 focuses on Daily Light Integral. These related tools help you understand root-zone conditions and solar exposure when you need a broader view of the growing environment.

Root-zone monitoring

EVO10 Smart Soil Monitor

Track soil moisture, root-zone temperature and daily sunlight trends over time with a leave-in Bluetooth soil monitor.

Explore EVO10 →
Solar site measurement

EVO-Solar Irradiance Data Logger

Measure real-time solar irradiance in W/m² and track accumulated solar radiation energy in kWh/m² for outdoor and solar-site evaluation.

Explore EVO-Solar →

Plant & Outdoor Measurement Guide

EVO-20 focuses on Daily Light Integral, but plant and outdoor measurement also includes soil moisture, root-zone temperature, solar irradiance and accumulated solar energy. See how these measurements differ and when each one is useful.

Read the Measurement Guide →

Stop Guessing Whether Your Plants Are Getting Enough Daily Light

Measure the accumulated light your plants actually receive with the EVO-20 DLI Meter.

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Measurement Definitions

What does Daily Light Integral mean?

Daily Light Integral describes plant-relevant light accumulated over the day. Use the EvoDevice Measurement Glossary to distinguish DLI from instantaneous light and solar irradiance.

Daily Light Integral (DLI) · Plant Light · Accumulated Light
Open Measurement Glossary →
Plant & Outdoor Product Selection

EVO-20, EVO10 or EVO-Solar?

Choose EVO-20 when Daily Light Integral is the main measurement. Compare it with EVO10 for root-zone monitoring and EVO-Solar for solar irradiance and accumulated solar energy.

Compare: EVO-20 · EVO10 · EVO-Solar
Compare EvoDevice Products →