No, this is not normal for any strain at 1.5 months. They definitely look light stressed like the other answer suggested, I'd back the light off to 10-12" for sure and see how they respond. But I'd also take a look at soil conditions as well. What is the PH like? I'm not seeing any Perlite etc to help with draining, so you may be holding too much water and suffocating the roots.