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Golly, where were they being kept?  I had a bulb go out on some week old chicks of mine and I only lost two out of a baker's dozen.  One drowned, one died later.  I had warmed it up with another one but I'd found it laying in the waterer so it must've aspirated some H2O.  Anywho, it was fine after I warmed it up and died the next day.
These were outside in a brooder box, pretty chilly that night too.
I like to wean mine off the higher wattage bulbs as early as possible.  I'll keep the heat on them the first few days to a week and then I switch to lower wattage bulbs (i.e. 100 watts to 60 watts, then to 34 watts, and I'll use a CFL as they start feathering out and the weather warms up).