in the add to cart button, you have the dimable column bound to the select list form element:
$ATC_itemDimmable = "".$_POST["LEDCart_1_Dimmable_Add"] ."";// column binding
instead, bind it to the option name column from the rsDIMMLOOKUP recordset, i believe that is the LEDprodvarname column:
$ATC_itemDimmable = "".$row_rsDIMMLOOKUP['LEDprodvarname'] ."";// column binding