Here I present the newest Nichia 4 dice NC4U133 (365nm) resp. NC4U134 (385nm) based UV LED system, rated 1340mW, linear control, active fan cooled, compatible with previous versions (collimator etc.).
That should currently be the most powerful single UV LED available.
[ P.S.: I have developed 2012 a much more powerful modular UV LED system which has been shown HERE.]
[click on image to see a larger one]
Special collimators / condensors have been developed for that system.
Now that LED in action, close-up shot of the 4 dice chip at minimum power (total 4 dice, width about 4mm), using UV-Mikrotar 30mm.
A comparison NC4U133 vs NCSU033 might be interesting; the older NCSU033 shown on the right was a P7 rank (which is about 20% better than the P6 rank, which is about 20% better than the P5 rank). The gain is about a factor of 3.5 to the older P7 version (*) - quite impressive.
(*) as measured with a calibrated UV power meter; this is NOT the ratio of the peak values.
[identical intensity scales. Measurements done at full load 700mA, after 10mins of operation i.e. in hot state, this is why the peak drifts a bit to 369nm]
Currently offered UV LED torches using the Nichia chip are usually using the P5 rank chip, the factor would then be about 5x power output in favor of this solution presented here.
REMARK: If working with these strong UV sources, make sure to ALWAYS USE PROPER EYE PROTECTION! Such goggles may be had for little money, but make sure they suppress UV to at least 420nm, like for instance the SKYPER type made by UVEX (pink line). Normal glasses (rose line) and normal goggles (magenta line) DON NOT PROTECT sufficiently.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos