Control/Dimming Extension Cords
That’s more expensive, and less useful than the SOOW, and you don’t need 10/3, you only need 12/3 for that. Plus, do you really want a bright yellow (or orange, for that matter) cord floating around?
The important thing to remember is that you don’t need to have 2P&G connectors on the cord. It’s the industry standard for incandescent lighting fixtures, but so long as you have the cable, you can put whichever connectors on the ends that you’d like. Within reason…
Your load is presently (2) 750w Source Fours. That’s [(750w*2 fixtures)/120volts] = 12.5amps.
According to Table 520.44 of the National Electrical Code, SOOW 12/3 would be allowable for 20A circuits, 14/3 for 15A circuits.
Also note that if you have the wiring to allow up to 20A, but put 5-15 (Edison) connectors on there, those connectors are rated at 15A and you should not use that cable for loads greater than 15A — the connector