The enlarger bulbs are a bit different, so Home Depot is probably out.
Classic Enlarger Bulbs:
-) have a plain opalisation.
Household opalized bulbs (likely rare anyway) may have a signing at the top, and that may be of effect, and then can be wiped/polished off.
-) are designed for lower voltage than the mains yields, thus in use driven by too high voltage. This in order to be more bluish than the household versions and thus gain more photochemical effect, on the price of reduced longevity.
With mains voltage risen over the last years, old stock enlarger lamps will be underrated even twice and thus be even more bluish and shortlived.
Filtratrion guides are related on true enlarger bulbs, driven by the apt mains voltage.
