Luminous efficiency is a necessary parameter for determining meteoroid massfrom optical emission. Despite this importance, it is very poorly known, withprevious results varying by up to two orders of magnitude for a given speed. Wepresent the most recent study of luminous efficiency values determined withmodern high-resolution instruments, by directly comparing dynamic andphotometric meteoroid masses. Fifteen non-fragmenting meteoroids were used,with a further five clearly fragmenting events for comparison. Twelve of thefifteen non-fragmenting meteoroids had luminous efficiencies less than 1%,while the fragmenting meteoroids had upper limits of a few tens of percent. Noclear trend with speed was seen, but there was a weak negative trend ofluminous efficiency on meteoroid mass, implying that smaller meteoroids radiatemore efficiently.
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