Creating a fluorescent lamp with krypton instead of neon or mercury is not feasible due to the fundamental differences in how these gases operate. Mercury vapor is preferred for its ability to produce significant UV light, which excites phosphors to emit visible light. Neon and krypton are classified as discharge lamps rather than fluorescent lamps, and while krypton discharge lamps are available commercially, they are costly. The discussion highlights that the properties and requirements for a krypton lamp would differ significantly from those of neon or mercury lamps. Overall, while krypton can be used in discharge lamps, it does not function effectively as a fluorescent lamp.