You can just imagine what a mess of the wavefrom two dimmers trying to cut the waveform would make, they'll just throw each others timing out, and do god knows what
You have to change what you have done IMMEDIATELY!!
Otherwise, as Adam says, they'll throw out the timing, and then you'll be travelling on a different space/time continuum, which will knock the earth off it's axis by 10 degrees, then we'll be in a reet pickle.
Actually no, it won't, but you have to get rid of one dimmer or they will toast each other.
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