Can I Take Away The Heat Lamp?

[HenHugs]

I have 3 baby chicks, each 43 days old (6 weeks and 1 day). They are already outside and days can be as hot as 70 degrees Fahrenheit but the nights can be low as 55. They have each other to stay warm and its mid July.
Should I take down the heat lamp?

 

[Pork Pie]

I would suggest that they are now fully capable of keeping warm and no longer need additional heating.

Ct