I have 150w bulbs in both of my cages, they work fine. There's no benefit to going to a higher wattage bulb unless you find that the smaller one can't maintain heat well or is "on all the time" - then you should use a higher wattage bulb, or a second fixture to maintain more even heat. In most applications though, while a higher wattage bulb would be "on" less, it's using more energy while it's on so it works out to about the same in the end as using a lower wattage bulb.
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