A practical reference for PAR, PPFD, DLI, visible light, UV, solar, vehicle-air-quality and surge-protection terms used across EvoDevice product pages, topic guides and the Measurement Knowledge Center.
These concepts separate instantaneous plant-light intensity from daily accumulated light, root-zone conditions and solar-resource measurements.
PAR refers to the wavelength range commonly treated as photosynthetically active for plants, approximately 400–700 nm. PAR describes a wavelength region; it is not itself a measurement unit.
Common wavelength range: 400–700 nm Plant & Outdoor Measurement Guide →PPFD describes the rate of PAR photons arriving at a surface per unit area. It is an instantaneous plant-light measurement and is commonly used when checking grow lights, sunlight and light distribution across a plant canopy.
Common unit: µmol/m²/s Compare PAR/PPFD tools →DLI is the total amount of photosynthetically active photons received over a 24-hour period. Unlike PPFD, which describes light intensity at a moment in time, DLI represents that plant-light exposure accumulated across the day.
Common unit: mol/m²/daySolar irradiance describes instantaneous solar power received per unit area. It answers the question: how much solar power is arriving at this moment?
Common unit: W/m² EVO-Solar →Accumulated solar energy represents solar exposure integrated over time. It is different from instantaneous irradiance and is useful for comparing total solar resource across hours or days.
Common unit: kWh/m² EVO-Solar →Root-zone measurements describe conditions where plant roots are actually growing. For soil monitoring, this can be more useful than judging conditions only from the surface.
EVO10 Smart Soil Monitor →UVA can be monitored as a separate optical component alongside PAR/PPFD in plant-light applications. A UVA reading should not be interpreted as PPFD or DLI, and plant-light UVA monitoring is a different application context from reptile UVI/UVA/UVB checks.
Typical UVA band: approximately 315–400 nm Plant & Outdoor Measurement Guide →Lux is a photometric unit of illuminance. It describes visible light falling on a surface using the wavelength sensitivity of human vision.
Unit: lx E130 Light Meter →CCT describes the apparent color of white light, from warmer-looking white light at lower values to cooler-looking white light at higher values.
Unit: kelvin (K) E130 Light Meter →Spectral distribution shows how optical energy is distributed across wavelength. For supported phosphor-converted white LEDs, this can reveal differences that a single Lux or CCT value cannot show by itself.
E130 White LED Spectrum Light Meter →UVI is a dimensionless index representing biologically effective ultraviolet radiation. In reptile lighting applications, it can be used alongside UVA and UVB measurements when checking a basking zone.
E-ABI UV Meter →UVA is the longer-wavelength part of ultraviolet radiation, generally approximately 315–400 nm. How the reading is interpreted depends on the application: plant-light monitoring and reptile-lighting checks use UVA in different measurement contexts.
Approximate band: 315–400 nm E-ABI UV Meter →UVB is the shorter-wavelength ultraviolet band generally approximately 280–315 nm. It is distinct from UVA and should be measured separately when the application requires it.
Approximate band: 280–315 nm E-ABI UV Meter →CO₂ is commonly measured in parts per million. In a vehicle cabin, rising CO₂ can indicate that occupant-generated carbon dioxide is accumulating faster than it is being removed by outside-air exchange.
Common unit: ppm Vehicle Air Quality Guide →Carbon monoxide is a toxic combustion gas and is completely different from carbon dioxide. A CO₂ monitor does not detect CO and is not a substitute for a certified carbon-monoxide alarm.
EVO-CO2V Car CO₂ Monitor →NDIR means non-dispersive infrared. The sensing method estimates CO₂ concentration by measuring infrared absorption associated with carbon dioxide.
EVO-CO2V Car CO₂ Monitor →Recirculation reuses more cabin air, while fresh-air mode increases outside-air exchange. Recirculation can be useful in many driving situations, but sustained recirculation can also reduce the rate at which occupant-generated CO₂ leaves the cabin.
Vehicle Air Quality Guide →An SPD is designed to limit transient overvoltage and divert surge current in an electrical installation. It is intended for short-duration surge events, not normal long-term voltage regulation.
Power & Surge Protection Guide →Whole-house surge protection is installed at the electrical panel to provide surge protection for multiple branch circuits. EvoDevice SPD products in this category are panel-mounted devices, not plug-in outlet protectors.
WFSPD2ULTRA → ALSPD2CORE →The glossary gives short definitions. The Topic Hubs explain how the concepts interact in real measurement workflows.
PAR/PPFD, DLI, soil and root-zone conditions, UVA, solar irradiance and accumulated energy.
Open guide →Lux, CCT, supported white-LED spectrum, UVI, UVA and UVB.
Open guide →Cabin CO₂, ventilation, recirculation, filtration and sensor interpretation.
Open guide →Whole-house surge protection, panel installation context and SPD concepts.
Open guide →