You can do one of 2 things:
1) Check if the existing pack has a preheat switch .If yes, switch it off and try...it may work.
2) Buy a DMX512 relay pack....the relays are potential free and usually switch on/off at 50% of the DMX512 value. You need to wire your LED circuit thru the relay contacts using a seperate mains connection.You can get 4/8 channel fully assembled circuit boards in the market and put it in your own cabinet. DO NOT use solid state DMX512 relay boards.
You cud get cheaper stuff if you hunt around on the net
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