| The J18 system consists of a J18 handheld meter and one of several interchangeable
heads (list below) which connect directly to the J18.
J1803 Luminance Head
- Video and projection screens
- Surface reflectance
- Computer displays
J1805 Head for LEDs - Output of red, yellow, green and blue
LEDs
J1806 Radiance/Radiant Intensity Head - Display color balance
J1810 Chromaticity Head
- Measurement of Chromaticity and White Balance of color monitors
- Color Temperature of Light Sources
J1811 Illuminance Head
- Highway illumination
- Luminaries and lamps
- Workstation illumination
- Lighting for safety
J1812 Irradiance Head
- Laser experiments
- Infrared LED testing
Characteristics
| |
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 |
|
