Ignition Risk Due to Optical Radation

Ignition Risk Due to Optical Radiation

It looks like this IEC standard (EN-60079-28) might not actually apply to luminaires anyway, from a draft document I found on the web. We’re looking into it, since it makes sense that there should be some limitations on optical power for HazLoc. Here’s a ballpark analysis, which indicates the CRS Electronics luminaires are not likely to be an ignition source due to the optical radiation emitted. However, if we maxed out the drive current for a luminaire, the optical flux can exceed the limits set by the IEC.

RSLED Immersion and Condensation Testing

Immersion and Condensation Testing

Condensation has been observed in the head of an early luminaire fixture installed in the field at the Manitouwadge Airport. A sample luminaire was repurposed for R&D evaluation and subjected to condensation and immersion testing. No evidence of condensation was observed after multiple warm-up and cold water immersion cycles, indicating that the fixture is well sealed at least when manufactured according to assembly instructions. However, some concern remains as to the long-term effects of pressure cycling the luminaire head with repeated warm-up/cool-down cycles.

How to kill a mosquito

How to kill a mosquito at 30 feet

Interesting question… Are we talking vaporize, ignite, or heat up until death for the mosquito? I’ll assume we want to minimize damage to surroundings so let’s just heat them up till they stop functioning. We’d need to figure out the temperature at which a majority of mosquitos will die. Since they seem to love hot weather, let’s assume we need to hit 100°C for them to fry. Estimating the average absorption coefficient for a mosquito when illuminated with the spectrum of your favorite LED source (50% of incident radiative power…

Remote Phosphors in Lighting Applications

Remote Phosphors in Lighting Applications

Several companies have heavily patented the use of remote phosphors in lighting applications. Most of these patents are broad enough to cover any LED use of phosphors. Additionally there are numerous application-specific patents out there by a wide range of companies. LEDs Magazine has a good overview article on the patent landscape for remote phosphors here. Cree is asserting a patent on remote phosphor based LED luminaires and bulbs, the rights to which are not automatically granted with the purchase of Cree royal blue LEDs. Cree’s licensing program is detailed…

Remote Phosphor Technology

Remote Phosphor Technology

Remote phosphors have been used in a number of competing LED lighting products, and are known as one route to increase fixture efficiency. Removing the heat generating phosphor from the LED chip and allowing it to be independently dissipated through the lens or case assembly enables the LED junction to maintain a lower temperature for the same luminous output. Prototype films have been made in-house at CRS Electronics to assess coating of phosphor powders to generate custom emission spectra for individual projects or special applications.

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