Topcon Optical Instrument Comparison

Westar carries a full line of Topcon optical instruments. If you need to measure light, we can help you select which Topcon photometer, colorimeter, spectroradiometer, color video photometer, or response detector is right for your application.

SpecificationsSR SeriesBM Series
Optical SystemSR-LEDHSR-LEDW
SR-LEDW-5N
SR-UL2
SR-UL2s
SR-UL1RSR-3ARBM-5ACBM-7ACBM-9A
Objective Lensf=82mm F2.5f=82mm F2.5f=80mm F2.5f=36mm F2.5
Eyepiece LensCollimating lens:
View field 5°
View field 5°,
Diopter adjustment range ±5 diopter
View field 5°,
Diopter adjustment range ±5 diopter
View field 5°
Apertures2° / 1° collimation only2° / 1° / 0.2°/ 0.1°3° / 2° / 1° / 0.2°/ 0.1°2° / 1° / 0.2°/ 0.1°2° / 1° / 0.2°
Measurement Distance350 mm to Inf.350 mm to Inf.350 mm to Inf.
Spot Size at 1mSR-LEDHSR-LEDW
SR-LEDW-5N
SR-UL2
SR-UL2s
SR-UL1RSR-3ARBM-5ACBM-7ACBM-9A
32.2 mm32.2 mm32.8 mm32.3 mm
16.1 mm16.1 mm16.4 mm16.2 mm
0.2°NA3.2 mm3.3 mm3.23 mm
0.1°NA1.6 mm1.6 mmNA
Spot Size at 35cmSR-LEDHSR-LEDW
SR-LEDW-5N
SR-UL2
SR-UL2s
SR-UL1RSR-3ARBM-5ACBM-7ACBM-9A
10 mm10 mm10 mm9.5 mm
5 mm5 mm5 mm4.8 mm
0.2°NA1 mm1 mm0.95 mm
0.1°NA0.5 mm0.5 mmNA
Luminance RangeSR-LEDHSR-LEDW
SR-LEDW-5N
SR-UL2
SR-UL2s
SR-UL1RSR-3ARBM-5ACBM-7ACBM-9A
Min Lv (cd/m2)100.00050.00050.0010.10.000050.010.01
Max Lv (cd/m2)4,500,0005,000,000300,0001,200,00012,000,00028,000,000
AccuracySR-LEDHSR-LEDW
SR-LEDW-5N
SR-UL2
SR-UL2s
SR-UL1RSR-3ARBM-5ACBM-7ACBM-9A
Luminance Accuracy±2% (for standard illuminant A)±4% (for standard illuminant A)±4% for L under 5 cd/m2, ±2% for L over 5 cd/m2±2% of reading ±2 digit
Color Accuracy±0.002 in 1931 CIE x,y Space±0.005 in 1931 CIE x,y Space±0.002 in 1931 CIE x,y SpaceNA
More InfoLEDHLEDW
LEDW-5N
UL2
UL2s
UL1R3ARBM-5ACBM-7ACBM-9A
Link to Product PageSR-LEDHSR-LEDWSR-UL2SR-UL1RSR-3ARBM-5ACBM-7ACBM-9A