Below is a short field test of the 642 against other commercially available strobe lights.
642 Sirius MILTAC Strobe
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A military/tactical personal strobe light offers the user the choice of a flashing covert IR signal (not visible to the human eye) or visible flashing bright white signal. To activate the IR signal, simply slide the switch to the “ON” position. Default IR mode prevents inadvertent white flash during critical covert operations. User must cycle switch three (3) times within five (5) seconds to activate the emergency white signal light. IR LED’s emit IR wavelength only, no filter required and no chance of white light leakage. Both IR and white signal can be detected at distances far greater than the military MS2000(M)™ CSAR Strobe.