Oh my goodness, how awful! I had no idea heat lamp bulbs could do that...I'm going to go check mine now. So sorry for your loss!
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....you said you had four hens (one year old?), and then brought home 10 chicks last month...but they were all together in the same coop? Or were they in a brooder under the heat lamp? And you found most (8 out of the 10?) of the young ones dead and also three of the older ones? I guess I am just trying to figure out what could have caused the tragedy (as I know you are!) I wouldn't think the older birds would be under a heat lamp, and if it was an older bulb I'd think the coating would have already burned away and fumes wouldn't be an issue.
) I checked for any tracks around it or signs that something may have scared them but found nothing at all.