Normal for nem to shrink after mh bulbs updated?

Tango451

New member
Is this normal. Ran lights for only 5 hours. Tomorrow was going to be 6 then 7 etc to slowly allow to adjust however my gig has shrunk down very very very small.

The bulbs that were upgraded are 400 watt radium 20k.

Is this normal? Do I need to run light for less time and do they recover from this? Other two look more or less fine
 

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