I also use the 575 krypton
and they are not super old either.
they were made between 2008 and 2013
Fitted as standard (Marin mac575) = GE CSR 575/S/DE/70
the 575 lamps are still very easy to get.
does not necessarily have to be the same brand!
make sure that the lamp
base is this: SFc 10-4
the
color temperature can differ, you have to pay attention to that, but if they are all the same, it doesn't matter whether you put 60 or 75 in it.
(the 60 is slightly more yellow than 75 this will be brighter white)
Lamp HMI 575 W, Double-ended, 1000 h, 95 V, 6500 K, SFc 10,, Special lamp: , This lamp is intended for stage and theatre applications., This lamp is not suitable for household room lighting.
www.thomann.de