Did the temperatures drop after switching lamps? Even different lamps of the same type can create different temps. If you double check and temps haven't changed, it might just be a natural slowdown for the wintertime. Most of mine eat less and sleep more in winter, even with no deliberate changes in the cages.

Another possibility might be parasites. Have they had a fecal check?
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Torey
Eugene, Oregon, USA
1.2 Saharan Uros (Joe, Arthur, and Hitch)
3.0 Mali Uros (Spike, Turtle, and Tank)
1.1 Ornate Uros (Scuttlebutt and Shazzbot)
1.2 Collared Lizards (Ripcord, Thiamine, and Riboflavin)
1.0 Green Anoles (Sprocket)
1.1 Housecats (Roscolux and Jenny)

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