20A (2400W) dimmer. Four fixtures with HPL575/115 lamps. Discuss.
If you don't use the correct voltage lamp you're very likely to blow it as the life reduces dramatically, but in answering questions like this it is fair to assume that a 575 lamp is using 575w.If you look at fuse ratings you will see that they run at a slight overload for a long time, certainly up to an hour.Over-running a lamp is not a linear increase as the resistance is very non linear with temperature so a simple calculation is inaccurate.
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