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@wvm
Mine are 5.4W GU10 bulbs so running straight off 240v. After roughly 5 minutes the heat sink was warm to hot but easily handled. A halogen example would have taken skin off.
Also, thinking out loud, I believe you may need transformers appropriate to LED lamps for MR16 fittings. The only other concern would be someone later replacing a failed bulb with a halogen one although the transformer may prohibit that.