Yeh it's best to wait it out, putting them in the dark for 3 days is a bit much, 24 hours of darkness can jump-start them but 3 days is just too long and will stress them. Actually I found that males tend to grow faster and taller then females, every 'alpha' plant I ever grew ended up being a male or hermie. Oh if you want to upgrade your light at some point Home Depot sells a 100w CFL flood-light for $60, add a chord and you can really grow well under it, and it costs less than an envirolight and fixture.