I'm sorry and I may be dense, but, does not the use of the word heat fit into the rule without clarification. ELECTRIC HEAT lamp and ELECTRIC HEAT source seem to me to be syn·on·y·mous which is defined as:
1 : having the character of a synomym; also : alike in meaning or significance
2 : having the same connotations, implications, or reference
Asking for a BOD ruling is akin to asking the Supreme Court to rule on the meaning of "We the people."