the bulb that will not light up is either damaged or a higher power than your ballast dude the bulb could be faulty if it was a ballast problem your other bulb would not work .hope you solve issue dude
i had same issue used rooting cubes and gell normally mine take 8 to 12 days to root but i had 10 or so that just did not root at all
if the mother is in survival mode like mine was the growth hormones are very slow in which case clones will die before they root 1 or soldiers may make it but in...