In 1973, Welch Allyn pioneered the use of halogen illumination in diagnostic instruments. Because of the many advantages offered over ordinary vacuum lighting, this significant breakthrough in instrument lighting has since been widely accepted and acclaimed by the medical profession. Now, in 1994, we have introduced a major new improvement in halogen lamp technology - Halogen HPX™.
All of Welch Allyn's 3.5v halogen diagnostic sets offer the highest light intensity and highest color-temperature illumination in the medical field - critical factors needed to bring out the natural color values of tissues being observed.
With up to six times the light intensity and 100% longer usable lamp life (compared to vacuum systems), 3.5v Halogen HPX™ illumination represents the ultimate instrument lighting.
In a ordinary incandescent filament lamp, tungsten evaporates from the filament and is deposited on the glass wall. This causes blackening of the glass and eventual lamp failure. In a Halogen HPX™ Lamp, halogen-xenon gas compound is added. As tungsten evaporates from the filament, it combines with the halogen compound rather than depositing on the glass wall. The tungsten-halogen compound is then carried by convection currents back to the filament where it is redeposited. The halogen compound is free to repeat the cycle. Since the redeposition of the tungsten is on the filament rather than on the glass wall, and due to the unique chemical composition used in Halogen HPX several advantages result:
At 70% of Halogen HPX lamp life,
light ouput is 85% of original output.
This graph (see below) clearly shows the
important differences in brightness and
longevity characteristics between Halogen
HPX and other halogen lamps.
Only Welch Allyn Halogen HPX provides 3250 degrees K color temperature which is maintained during the entire life of the lamp, providing the most accurate observation of tissue color.
Welch Allyn 3.5v Otoscopes