There is no scent throw
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Surface area is the variable
A melt that pools shallow and wide in a warmer gives off more than one that sits as a lump. Portion size and shape therefore change the customer’s experience independently of the fragrance load.
Above the wax’s ceiling, extra oil does nothing
Past what the wax can hold the oil separates rather than releasing gradually. The result is a greasy surface, a weaker throw than expected and a customer who concludes the product is cheap.
Warmers differ enormously
An electric plate and a tealight warmer run at different temperatures, and the same melt performs differently in each. Saying what you tested with is more useful than a claim about room size.
Cold throw is not warm throw
A jar that smells strong on opening can be unremarkable in use, because the volatiles that reach you across a counter are not the ones that carry a room. Judging a batch by its cold throw is the common mistake.
Portion size is a product decision
Six small cubes and one large block of the same weight behave differently, and the pack format decides which the customer gets. That is worth deciding deliberately rather than by what the mold produced.
Test in a real warmer, for a full session
Not a sniff at the bench. One melt, one warmer, a few hours, in a room the size you are claiming for. It is slow and it is the only test that answers the question customers ask.
Describe the performance you actually tested
A wattage, a warmer type and a room size you have tried beat a claim about square footage you have not. Customers in this category compare notes in public, so an overstated claim is tested for you whether you wanted it tested or not.