From what I remember bugbee says plants are ready to go and get full light the second they turn on and the ramp up and down isn't needed.I've only done a couple of photos, but it sounds like you are worrying too much. She'll be fine. They do sell some lights now that ramp up and down gradually to simulate natural light cycles. I suspect it's a gimmick and doesn't make a difference. I'll look forward to input from the photo growers.
I don't grow photos so this may not translate but I would say you're fine. Plants will adapt to your tent cycle. Light leaks would really be my only concern, you should be fine!