Havells bulbs (I buy them at Southern States) are not coated. The are also sold by McMurray Hatchery. They have an article on there site about the safety concern with coated bulbs.
I had used the bulbs from TSC for another batch of chicks just a month before. (The bulbs came 2 in a box) I did...
I lost 8 out of 14 of my day old chicks. They were all healthy and active until they suddenly 1by 1 started chirping loudly and then starting flopping around until they died minutes later. It was horrific to watch. I have been trying to figure out what possibly could have caused such a sudden...