will the dark hold the growing process

[jolly green giant]

just needed some help here...
my seedlings are in a proporgator at the moment by the window,and not getting great light.i was supposed to get my sodium light today but will only be getting it tomorrow.
i am worried the plants will become streched,is it a good idea to keep them in the dark untill i get the light tmr night?and what light should i give them once set up?the little guys are about 2 inchs high????

thanks

a sodium light may make your seedlings stretch anyway, they like blue light at seedling and veg stages.
if you can get some cool blue floros for the seedling stage and then use the hps after about 2-3 weeks. dont keep them in the dark. hope this helps..