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. CSA doesn’t test to this specification, but as we go through IEC certification it may come up. The liquid cooled XCAN in the basement is well above the allowable flux limits (5mW/mm2). If it can fry flying insects, it’s probably not going to be a good idea to put it in a hazloc area.
- The max optical flux will be at the surface of the TIR lens
- The optical flux may not be uniform across the surface of the lens but by the time it passes through the window any hot spots should have evened out (This is a somewhat questionable assumption, we would need to do more modelling to define it better to account for actual beam profile – probably an extra couple hours work)
- Radiometric efficiency is 33% (what I previously measured for a cool while XML at 113lm/W efficacy, should be slightly better than what the XCAN or RS LEDs will be operated at)
- All optical power passes within the FWHM cone (a conservative estimate)