May I take this to mean...
...ten kilotons of TNT (i.e. 4.2*10^19 J)???
'Running' with the above figure we're talking ~ 1/12,000'Th of one Esoteric Unit (1 EU=5*10^23 Joules [approx 120 Teratons TNT] --- as defined by Keely [q.v.])
That so trifling a 'yield' should be 'naked eye' visible at a distance of 1 LD is *astonishing* - am I missing something???
With sincere interest
Dan Sarandon