Your chicks look just great! You can probably turn off the pad. I'm trying to understand what you meant by "going in" after you shined the flashlight for them. Did you mean going into the cave, or into their pen? If they don't want to go into their cave that's fine. They shouldn't be needing it at this point. You could even dispense with the cave altogether and just leave them some extra bedding where the cave used to be. But if you meant going into their pen, then I'd herd them in at sundown and give them a little time to figure out where they're going to huddle up for the night. At 5.5 weeks my chicks last year were sleeping in an unheated, unheated coop with nighttime temperatures below 20 degrees and the coop wasn't even finished around them yet. And it snowed. It kept snowing until our last snowfall on June 6th. So yours will be perfectly fine at this age in 50 and 60 degrees. Congratulations, Broody Brigade Mama! You DID it!
Edited to add: I hit "submit" before I finished because the stoopid phone rang. Who calls this late, anyway? Someone looking for Brian. Keep looking, buddy. Anyway, that is so cool that MHP is now on Pintrest! This is taking on a life of its own and that's fantastic! First Meyer Hatchery was interested, and now Pintrest mentioned it. Deb, if that was you, BLESS YOU! So how do you suppose we can get one of the major chicken magazines to cover brooding chicks outdoors? Nah, never happen. I was thumbing through one today at the feed store and it was discussing how to brood chicks. Wait to get chicks until late spring or early summer. Brood indoors. With heat lamps. Maintaining 95 degrees for the first week, 90 the second, yadda yadda.