The new, patented LR-127 LED Analyzer is a unique tool for making luminous intensity (in candelas) measurements of discrete LED's for compliance to CIE 127 Condition A (2°) and Condition B (6.5°). It can be ordered with three of our world class instruments the PR-650, PR-705 / 715 and the PR-880.

All other commercially available devices designed for CIE 127 compliance testing require that the LED be tested twice, in two different setups, to perform a complete test. Typically, this means utilizing two tubes of different lengths. Since the optical path of most discrete LED's is rarely in alignment with the packaging, even small changes in the relationship between the measuring and emittance paths between tests can result in inaccurate and or non-repeatable results. By simply repositioning a slide from "A" to "B" (or vice versa) the LR-127 is set to test to the to the required measuring geometry.

Like all optical accessories for Photo Research instruments, the LR-127 is supplied with a NIST traceable calibration from the factory and certified for accuracy for six months. There is never a need to calibrate the accessory every time it is used with the instrument.

During operation, the LED is inserted into a special holder that insures that it is securely mounted. Two holders are supplied and accept either T-1 (3mm) or T- 1.75 (5 mm) packages. Contact us for special sizes.

The following table lists minimum sensitivities for the LR-127 by instrument and LED peak wavelength. All values are typical. Actual sensitivities may vary.

Measuring Aperture LED WL(nm) CIE 127 Condition 3° 2° 1° ½° ¼° 1/8° PR-880 470 A 0.14 0.0315 1.2 4.8 20 80 millicandellas B 0.014 0.0315 0.12 0.48 2 8 525 A 0.14 0.315 1.2 4.8 20 80 B 0.014 0.0315 0.12 0.48 2 8 594 A 0.14 0.0315 1.2 4.8 20 80 B 0.014 0.0315 0.12 0.48 2 8 638 A 0.1 0.225 0.9 3.6 14 60 B 0.01 0.0225 0.09 0.36 1.4 6 PR-705 470 A NA NR 8 30 120 500 B 0.8 3 12 50 525 A 8 30 120 500 B 0.8 3 12 50 594 A 8 30 120 500 B 0.8 3 12 50 638 A 5 20 80 300 B 0.5 2 8 30 PR-650 470 A NA NA 40 10 NA NA B 4 1 525 A 40 10 B 4 1 594 A 50 12.5 B 5 1.25 638 A 60 15 B 6 1.5