What is the origin of the idiom "more heat than light" and when to use it?

The origin of the phrase "more heat than light" can be traced back to the late 19th or early 20th century. It is derived from the metaphorical use of "heat" and "light" to represent different aspects of a discussion or debate. "Heat" refers to the emotional intensity, conflict, or passionate arguments that can arise, while "light" symbolizes the exchange of meaningful information, insights, or productive discourse. This phrase is often used to critique unproductive or hostile exchanges, highlighting the need for constructive dialogue and substantive contributions. It can be applied to formal debates, public discussions, online forums, or any situation where the emphasis on emotional intensity hinders the generation of valuable insights, compromises, or progress.