I encourage most new growers to try this various stuff for themselves, at least with things that won't hurt your plants. The dark period won't hurt anything.
I just never saw a benefit worth messing with my light cycles. I pretty much always had different age plants in my garden, so turning the lights out for extra time always felt like it had the potential to hurt more in my case then anything it could have helped. I never had the chance to do lab testing on my buds so I couldn't tell you if lights out added an extra 1% THC or anything like that, but it didn't make a smokeable or visible difference.