its more than 8
average damage shows figures in cooldown, but not duration
Kol's beams have a 4 second fire time paired with a 14 second cooldown.
(4/14*128) you're getting about 36 DPS.
at level 10 you have a +27% to weapon cooldown and 45% bonus to damage, which brings it to about 73 DPS according to my calculations.
by comparison, Advent's radiance's front beams do 60 DPS to start with.
(105*4/7)=60
again getting a +27% cooldown and +45% to damage(seems to be common?), you end up with 119 DPS. someone care to check these numbers?
neither factor in any upgrades.