Brightness depends on how much light is in the visible range. What is happening is that as the device gets hotter, a greater percentage of the light falls in the visible range, AND, a greater total amount of radiative energy is being emitted. Both are going on at the same time. It gets bright enough to want some darkening glasses (and put on your shiny sunscreen oil for the infrared).
On Wed, Dec 10, 2014 at 11:01 AM, Finlay MacNab <finlaymac...@hotmail.com> wrote: > > > ------------------------------ > > *Hard to look at with the naked eye? I don't recall anything in the > lugano report about the ecat being hard to look at.* > > I am not sure this is correct. > > An examination of black body radiative power versus temperature shows that > below 3000 degrees kelvin the emission from a hot body is diffuse and the > bulk of the energy is at longer wavelengths. > https://www.e-education.psu.edu/astro801/content/l3_p5.html > > A 1700K radiator (1400 Celsius) has a peak emission intensity of around > 1.7microns in the infrared. > > The wikipedia page on infra-red heaters has a picture of quartz heating > elements that operate at 1500C. The text accompanying the picture implies > that the lamp is radiating 100W/inch or 780 W over 20cm (the length of the > Rossi reactor). http://en.wikipedia.org/wiki/Infrared_heater > > Based on this information, I don't think the reactor would have to appear > very bright to the naked eye. > > Finlay >
