Product category:
Other analytical instruments
News Release from: Pro-Lite Technology | Subject: SLMS-0400
Edited by the Laboratorytalk Editorial
Team on 10 February 2005
Fast and accurate LED testing
Spectral lamp measurement systems provide a fast, accurate way to determine the optical properties of light emitting diodes (LEDs), miniature lamps and laser diodes
Pro-Lite has released the SLMS-0400 series spectral lamp measurement systems from Labsphere, which it says provide a fast, accurate way to determine the optical properties of light emitting diodes (LEDs), miniature lamps and laser diodes The SLMS-0411 and SLMS-0421 are spectral lamp measurement systems built around a compact, 100mm diameter integrating sphere
This article was originally published on Laboratorytalk on 25 Jun 2003 at 8.00am (UK)
Related stories
Widely tunable dye laser
Can be pumped by almost any commercially available Q-switched Nd:YAG or Excimer laser at up to 1J and provides nano-second pulsed outputs widely tunable in the spectral range from 205 to 4500nm
Ultra-compact Q-switched Nd:YAG laser
Employs cost-effective flashlamp pumping to deliver outputs from 100 to 1200mJ at 1064nm, repetition rates from 1-100Hz, Q-switched pulses from 5-11ns
Each system consists of an integrating sphere, a diode array spectrometer instrument, a current-regulated power supply and Labsphere SLMS software.
The systems also include a calibrated spectral flux standard for system calibration and an auxiliary lamp, used as a control to correct for certain measurement errors.
Two different spectrometers are offered providing access to the 390-760nm (CIE colorimetric) range for visible wavelength devices (SLMS-0411), and 350-1050nm for extended coverage into the UV/blue and infrared regions (SLMS-0421).
LEDs from 0.1 to 300 lumens (5mW to 15W approx) can be accommodated in the 100mm sphere; a larger integrating sphere is available for testing higher powered devices.
SLMS-0400 series systems feature a Labsphere LMS-040 integrating sphere which uniformly collects the light emitted by the device under test regardless of the beam size or divergence.
The sphere is hinged to simplify internal access to the central device mount.
Directional test sources may also be measured from an external position, through a port in the sphere wall.
Some of the benefits arising from the use of an integrating sphere spectrometer in LED testing include the elimination of the characteristic photopic response matching errors with white, blue and red LEDs compared with filter based photometers, and a much-reduced sensitivity to light source alignment.
Light collected by the sphere is passed to the spectrograph, which analyses it in order to obtain a reading of the source spectral power distribution.
This spectral data is processed by the SLMS system software in order to accurately compute luminous flux and colour properties including CIE chromaticity, correlated colour temperature and colour rendering indices.
Properties particularly applicable to LEDs can also be calculated, such as peak, central, and centroid wavelength, spectral bandwidth, dominant wavelength and purity.
• Pro-Lite Technology: contact details and other news
• Email this article to a colleague
• Register for the free Laboratorytalk email newsletter
• Laboratorytalk Home Page
Search the Pro-Talk network of sites
