In November I rooted a dozen cuttings in an old fish tank I had laying around. I had the cuttings in cups with a 50/50 mix of Scott's potting soil and perlite. I filled the tank with a few inches of water and utilized an aquarium heater to keep the water around 80 degrees. This provided both bottom heat for the cups as well as humidity. I had the aquarium light on the tank for about 10 hours a day. The cuttings all budded and leafed out great but with minimal or sometimes no roots at all. I'm currently trying to salvage these cuttings. I don't want to make the same mistake again. Should I try and root them without the light so that the cuttings don't leaf out before rooting?currently my second batch is in a heated utility room, about 78 degrees and no light. I have clear cups over the cuttings to keep the humidity up. Should I give them some light or keep them dark till they hopefully show roots? Thanks.

Light isn't going to affect when the leaves push. But you do want to provide some light after they start to push.

I don't know why your cuttings haven't rooted. But don't think it's related to light.

It really is a mystery for me how to supress pushing buds out before cuttings root.

Have heard; if rooted in the dark that helps rooting more and if bottom heat used again it can help rooting before pushing bud break.

But in practice for me it has been a crap shoot. 
Had many cuttings in January grow roots & no sign of buds until recently. 
Early this month got a bunch of cuttings and they all broke buds with no sign of roots.  completely opposite almost funny.

In cases where buds breakout 1st I also do what Steve does & provide light & a little more humidity since leaves need to be supported with no roots. 
Still confident these will root & be successful.  Also will spray leaves 2 a day so they hang in until roots form.

Since I am very new to rooting figs cuttings ( first time ),  I gave them light after cuttings shows some roots and it worked great for me.
Here is a link for the post what I did just posted on the weekend

http://figs4funforum.websitetoolbox.com/post/new-member-and-rooting-lots-of-cuttings-in-coco-coir-8418324?pid=1294902297