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Characterization of Light Emitting Diodes (LEDs) and Compact Fluorescent Lamps (CFLs) by UV-Visible Spectrophotometry
Author: C. Mark Talbott, Ph.D., Robert H. Clifford, Ph.D.
Wednesday, October 10, 2012

The acceptance and commercial utilization of Compact Fluorescent Lamps (CFLs) and, more recently, Light Emitting Diodes (LEDs) have grown significantly in the past five years, leading to increased research. This paper demonstrates the use of a typical laboratory UV-Vis spectrophotometer to measure and characterize CFL and LED lamps, focusing on spectral characteristics such as peak wavelength, Full Width at Half Maximum, centroid wavelength, dominant wavelength, color, and color purity.

File: LEDsWhitepaper.pdf (1.01 MB)
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An Introduction to Pulsed-Current Laser Diode Drivers
The paper helps the reader to understand pulsed-current laser diode drivers and choose the right one for his or her application by explaining the basics of how they work and the components that comprise them. Ideal and real current sources are defined and explained, leading to an explanation of compliance voltage.
- IXYS Colorado
High Speed Lightwave Component Analysis
As lightwave transmission systems become more advanced, component designers and manufacturers must maximize the performance of their devices. For example, one parameter often used to specify digital system performance is bit error rate. However, it is difficult to specify individual components in such terms. Rather, fundamental measurements such as gain, bandwidth, frequency response and return loss can be appropriate.
- Agilent Technologies, Inc.
Measuring Optical Densities Over 10 Abs on the Agilent Cary 7000 Universal Measurement Spectrophotometer (UMS)
High blocking optical filters deliver critical optical control in a wide variety of consumer and industrial products. Highly attenuating (i.e., high optical density) filters are used in personal protective equipment, such as laser safety eyewear, through to precise, low light level control in optical systems for enhanced sensitivity at preferred wavelengths. This technical overview demonstrates the performance of the Cary 7000 UMS for the measurement of such materials.
- Agilent Technologies, Inc., Chemical Analysis

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