One successful method of applying such silane agent is to submerge the primary encapsulated lamp in a solution comprising the silane agent taken together with a solvent, such as methylethyl ketone mixed with N-propyl alcohol (an additional wetting agent, such as a high molecular weight agent sold under the trade designations BYK-P-104M by Byk-Gulden, Inc., Hicksville, L.I., New York, may be used,