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I asked an electrical engineer (designer) I work with. He said that for a lab power supply it would be do-able. (Referring to power supplies we use in our labs.) However, for a "cheap" power supply that is likely to come with low voltage lighting systems, it would be bad. They likely don't have very good current limiting, and so the transformer would overheat and eventually burn out.

As a general rule, you do NOT want to run in a current-limited mode for any length of time.

He recommends either reducing bulb wattage (demand) or increasing transformer capacity (supply) such that you are NOT current-limited.
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