Tektronix J18 LumaColor Photometer System

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The J18 system consists of a J18 handheld meter and one of several interchangeable heads (list below) which connect directly to the J18.

J1805 Head for LEDs - Output of red, yellow, green and blue LEDs

J1806 Radiance/Radiant Intensity Head - Display color balance

J1803	J1805	J1806	J1810	J1811	J1812
Measurement
Luminance	Luminance Intensity	Radiant Intensity	Chromaticity, Luminance	Illuminance	Irradiance
Applications
Displays, Television, Medical	LEDs	Displays, Television	Displays, Television	Highway lighting, Office lighting, Transportation	Lasers, IR LEDs, Research
Ranges
0.3 to 300,000 candelas/m² (Nit) 0.1 to 100,000 footlamberts	0.01 millicandelas to 10 candelas	0.001 to 200 W/m²/sr	0.001 to 0.999 x, y and u', v' 0.3 to 1,000 candelas/m² (Nit) 0.1 to 300 footlamberts	0.01 to 5,000 lux (lm/m²⁾ 0.01 to 500 footcandles	0.001 to 2,000 mW/m² 0.1 nW to 0.2 mW
Spectral Response
CIE Photopic	CIE Photopic	Flat	CIE Tristimulus	CIE Photopic	Flat
Spectral Accuracy
f₁' = <3% (DIN Class A)	f₁' = <3% (DIN Class A)	±8% 450 to 750 nm	f₁' = <3% (DIN Class A)	f₁' = <3% (DIN Class A)	±8% 450 to 950 nm
Acceptance Angle
8°	8°	8°	16°	180° (Cosine)	96° (Approx.)
Other Features
Suction cup	LED adapters	Suction cup	Suction cup	Level and cover	Cover