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.
August 2011.
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.
Have you ever wondered how tyrants get away with what they do? These two books will help you understand some of the psychology behind why this happens and how to not be part of the problem.
November 2025.
A summary of the theory, science and history of Dr. John Beard's trophoblastic theory of cancer and the resulting pancreatic enzyme treatment of cancer. Includes references.
February 2017.
Sam Cohen invented the neutron bomb. Learn the history behind the neutron bomb in his autobiography. Sam Cohan passed away in 2010 at the age of 89.
September 2015.
This is a review of the Charmhigh CHMT48VB pick-and-place system and the lack of product support. Also provided is the DPV file format documentation (DPV V1.0 specification - PDF) and a spreadsheet for generating DPV files (LibreOffice spreadsheet format).
September 2025.
A proposed standard for measuring flashlight output that would
provide consumers useful data to compare one flashlight to
another. Note that since this paper was written, the FL-1 ANSI
Standard has been released.
September 2005.