Disclosed is a new and useful discharge lamp for use in applications, such
as tanning and technical lighting, and a method of making the same. The discharge
lamp includes, inter alia, a vitreous tube having an axial length, a base phosphor
coating applied on the interior of the tube along the entire axial length, and
at least one phosphor over-coat applied over the base phosphor coating in one or
more axial regions of the vitreous tube. The phosphor over-coat is applied to less
than the total length of the vitreous tube. In a representative embodiment, the
vitreous tube has an outer periphery which is smooth, but in alternate embodiments,
a helical groove path is formed therein over at least a portion of the axial length.
