	DLI-400	DLI-500	DLI-600
Calibration Uncertainty	± 5 %	± 5 %	± 5 %
Measurement Repeatability	Less than 0.5 %	Less than 0.5 %	Less than 0.5 %
Display Range	0 to 4000 µmol m^-2 s^-1	0 to 4000 µmol m^-2 s^-1	0 to 4000 µmol m^-2 s^-1
Long-term Drift	Less than 2 % per year	Less than 2 % per year	Less than 2 % per year
Field of View	180°	180°	180°
Spectral Measurement Range (± 5 nm)	370 to 650 nm (sunlight only)	389 to 692 nm	383 to 757 nm
Directional (Cosine) Response	± 5 % at 75° zenith angle	± 5 % at 75° zenith angle	± 5 % at 75° zenith angle
Temperature Response	-0.04 % per C	-0.11 ± 0.04 % per C	-0.11 ± 0.04 % per C
Response Time	2.5 seconds	2.5 seconds	2.5 seconds
Measurement Frequency	3 minutes	3 minutes	3 minutes
Data Log Capacity	99 days (DLI & Photoperiod), 10 days (30 min PPFD/ePPFD averages)	99 days (DLI & Photoperiod), 10 days (30 min PPFD/ePPFD averages)	99 days (DLI & Photoperiod), 10 days (30 min PPFD/ePPFD averages)
Non-linearity	Less than 1 % (up to 2500 µmol m^-2 s^-1)	Less than 1 % (up to 4000 µmol m^-2 s^-1)	Less than 1 % (up to 4000 µmol m^-2 s^-1)
Stored Data Resolution (PPFD)	0.1 µmol m^-2 s^-1 (when ≥ 1000, the screen will not display the decimal)	0.1 µmol m^-2 s^-1 (when ≥ 1000, the screen will not display the decimal)	0.1 µmol m^-2 s^-1 (when ≥ 1000, the screen will not display the decimal)
Stored Data Resolution (DLI)	0.1 mol m^-2 day^-1	0.1 mol m^-2 day^-1	0.1 mol m^-2 day^-1
Stored Data Resolution (Photoperiod)	0.1 hours	0.1 hours	0.1 hours
Connectivity	CSV file via USB-C data transfer	CSV file via USB-C data transfer	CSV file via USB-C data transfer
ADC Resolution	24 bits	24 bits	24 bits
Operating Environment	-10 to 60 C; 0 to 100 % relative humidity	-40 to 70 C; 0 to 100 % relative humidity	-40 to 70 C; 0 to 100 % relative humidity
Ingress Protection	IP65	IP65	IP65
Mounting Compatibility	Brass ¹/₄-20 threaded mount	Brass ¹/₄-20 threaded mount	Brass ¹/₄-20 threaded mount
Battery Type	2 AAA batteries	2 AAA batteries	2 AAA batteries
Battery Life	Approximately 6 months	Approximately 6 months	Approximately 6 months
Dimensions	1.91 W x 2.31 H x 0.93 D (inches)	1.91 W x 2.31 H x 0.93 D (inches)	1.91 W x 2.31 H x 0.93 D (inches)
Mass	67 g	67 g	67 g
Warranty	4 years against defects in materials and workmanship	4 years against defects in materials and workmanship	4 years against defects in materials and workmanship

Calibration Uncertainty

± 5 %

Measurement Repeatability

Less than 0.5 %

Display Range

0 to 4000 µmol m^-2 s^-1

Long-term Drift

Less than 2 % per year

Field of View

180°

Spectral Measurement Range (± 5 nm)

370 to 650 nm (sunlight only)