They are autoflowers? so as long as you even out the height it should be fine. Once they are mature, they can all handle 35-40 DLI. You observe and adjust from there... if nodes are too tight, you dim the light a bit. if they are too stretchy, increase it a bit.
if you don't have a dimmer, adjusting hours of operation is an option. Go from 18h to 16h and that reduced DLI by 1/9th. 40dli becomes 35.55555
i wouldn't go below 12h just because intensity starts to get too high. that won't be the case here but for future reference.
DLI = yield. doesn't matter much if you give it over 12-14-16-18h.
read the wiki to get the gist. it will explain it better.