Technical and Historic Articles
- LED Flashlight White Paper (PDF)
- A white paper discussion of LED flashlight design. It covers the optical, thermal, electrical, mechanical and interface issues involved in designing a flashlight with LEDs. The paper also discusses how the human visual system works and how that impacts the flashlight design. September 2004.
- CR123A disposable and rechargeable lithium batteries
- Disposable and rechargeable lithium battery discussion. February 2006.
- Can You Patent an LED Flashlight? (PDF)
- A paper discussing the issues and validity of recent LED flashlight patents. January 2003.
- Proposed Standard for Measuring Flashlight Output (PDF)
- A proposed standard for measuring flashlight output that would provide consumers useful data to compare one flashlight to another. September 2005.
- Why Cyalumes® and Other Chemical Light Sticks Make Poor Backup Lights
- Cyalumes and other chemical light sticks have many characteristics that make them seem ideal as a backup light source. However, they cannot be trusted to produce light when you need it most. September 1999.
- Birth of a New Lamp System
- A historic account of the Action Light project including a look at older technology designs. April 1999.
- Using the new Osram Dragon LEDs for bi-color lights
- The new Osram Dragon-series LED emitters use a red LED for the ESD protection diode - an interesting fact that the specification sheet dated February 16, 2007 fails to mention. Further, the specification sheet states in the Maximum Rating section that the LED is not designed for continuous reverse operation. However, a clever application of this "feature" would be in a flashlight that provides power in the forward direction for white light and power in the reverse direction for red light. The Osram Ceramos LED emitter is another candidate for this application as are any other current or future devices that share these characteristics. Article coming soon.
- Power Supply Design for LED Flashlights (PDF)
- Discusses inductive switching power supplies and regulation systems in the context of LED flashlights. September 2007.
- An Abridged Collection of Interdisciplinary Laws
- A large collection of interdisciplinary laws. January 1979.
Copyright © 2008 by HDS Systems, Inc. All rights reserved.
Trademarks and trade names are the property of their respective owners.
Updated January 2008
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