I had a similar problem (my wattage is a bit too high) so I just raised the light a little bit above the tank to decrease the heat that got into the tank. I don't think that getting rid of a light would stress them out, since they sleep through it anway. However, my snake's awake-asleep cycles seem directly coordinated to when his lights go on and off. Did they look stressed to you when you changed? (have their eating habits changed?)
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1.1 ball pythons (Huxley and Marla)
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* Mollie *
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