Heat issue?

Hey guys!
So i finally installed my lightbar (4 cxb3590) the growmou5e kit with the passiv heatsinks i had it turned on in my grow shower and the heatsinks got really hot is that normal? How hot are they allowed to get?
Thanks greenginko

You should be able to keep a hand on them.

Airwalker16 said:

You should be able to keep a hand on them.

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And if it gets too hot in the night will it destroy my Cobs?