Everyone knows the number for the speed of light — but almost nobody knows the uncomfortable truth behind it. Measuring light ...

We don't usually think in terms of a "volume of light." We tend to speak of brightness. But the amount of anything available in a given space is called a volume. "Please pass a quart of light" sounds ...

An international collaboration of researchers developed two new complementary approaches for versatile but precise light intensity measurements in fluorescence imaging systems. Accurate measurements ...

The great Galileo Galilei (1564-1642) tried to measure the velocity of light by means of lantern signals between mountain tops. Naturally he failed. Light travels about 186,270 miles (more than seven ...

Ophir Optronics Inc. has introduced two new measurement heads. The PD300-BB radiometer head has a spectrally flat response from 400-1,000 nm. and is recommended when the power measurement of broadband ...