Tomato seedlings are sad. Did I miss something?

[beeskwared]

Good morning everyone!
My first post of the season (at least the northern hemi)
I'm not sure if this is the right place to post this. My tomato seedlings have been indoors all along, 12 hrs/day until a grow lamp, and started 30 minutes daily outdoor acclimation about 3 weeks ago. But the seedlings seem sad! I suspect it's leaf burn from the (albeit limited) sun exposure I've been giving them. But I thought I'd post here for confirmation. Any ideas?

Thanks so much!
Brian