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 Nemalux XCAN and RSLED are not likely to be an ignition source due to the optical radiation emitted. However, if we maxed out the drive current for an RS, the optical flux can exceed the limits set by the IEC.
Condensation has been observed in the head of an early RS fixture installed in the field at the Manitouwadge Airport. A sample RSLED 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 RS head with repeated warm-up/cool-down cycles.
This is a study of the XCANLEDDC device under various environmental conditions. The testing proceeded in 3 parts. The first part was a 1000 hour test which cycled temperature between -55°C and 105°C while turning the power to the light fixture off and on again. The second part was a 24-hour high temperature soak, where the device was kept at the temperature of 107°C, and while the power to the device was turned off for 2 hours and then turned back on for two hours, and repeated until test conclusion. The final test was identical to the second test, excepting that the temperature was set to -55°C.
This is a study of hydrostatic pressure resistance of two different lighting fixtures. As per “Device Pressure Testing” quotation, two separate devices, the EXLLED-AC-C1D1, and the EXLED-AC-C1D1, were first filled with oil, attached to our DHI pressure generator system, and then submitted to hydrostatic pressure.
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 absorbed?), cross sectional area presented to the beam (1mm2?), and mosquito heat capacity (likely somewhere near that of water, 75.3 J/mol.K), and average weight (2.5mg).Another limiting factor will likely be time-on-target for the beam. According to Wolfram Alpha the max speed of a mosquito is 1.4km/h or 0.39m/s, which means a transit time of 0.26second to fly through a 10cm diameter beamFrom 2,3,4 we can determine the radiometric power needed.
An explosion proof lighting fixture indicates that if explosive gas gathers inside the fixture and then explodes, the fixture will contain the explosion. The design of the fixture then, needs to have a “flame path” where the fire is extinguished, but the pressure is released. In the certification process, this is done with different gases and sparkplugs. In some of our research we used hydraulic pressure to test the maximum pressure that a fixture can contain without deforming. This can be a very dangerous process.