In article ,
"OBone" writes:

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If a light switch dimmer is rated at 500W for an Incandescent light will it
be alright for 10x50w halogens that are 240V.

You'll have to check the instructions for that switch.
Often they require 50% derating for halogen loads.
Sounds like a particulary silly lighting scheme though.

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Andrew Gabriel
[email address is not usable -- followup in the newsgroup]