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With over 80 years of delivering high-performance As with any advanced technology, it is important that lighting solutions to customers worldwide, Welch Allyn you understand key application techniques. This HPX continues this tradition with its HPX technology. Technical Operation Guide has been arranged to help you easily find the information you need for your Our enviable reputation for engineering lighting specific application. It summarizes important lamp solutions that exceed industry performance standards, configuration, performance data and technical while providing the consistent light...

HPX ENGINEERING & INDUSTRY LEADERSHIP Lamp Tolerances Potential output variation, % MSCP Industry standards typically specify lamps with current draw tolerances of ±10%. This means that light output can vary anywhere from 30%–40%. HPX lamps typically have current draw tolerances of ±5%. This, in turn, reduces the possible light variance to just 15%–20%, giving you higher-quality, uniform illumination. Industry standard 30-40% output variation Welch Allyn has developed several proprietary design, tight-tolerance manufacturing and quality-checking processes for all of our lamps. These PERFO N methods...

It is recommended that you check with Welch Allyn engineers for the critical temperature for the lamp you select. These lamps are very application dependent, with duty cycle and heat sinking being prime considerations. Halogen Advantages • Highest color temperature • Highest luminous efficacy • Superior maintenance and life as a result of the halogen regenerative cycle • Color temperatures typically range from 2,700˚K to 3,350˚K with current draw less than 3.0 amperes • Surface temperature is similar to comparable gas-filled lamps (halogen lamps do run slightly higher than a vacuum lamp of comparable...

Our halogen lamps not only have a higher output at a given wattage, they also have superior maintenance. Gas-filled lamps have superior maintenance to vacuum lamps and in some applications, where there is a short duty cycle or significant heat sinking, they are superior to halogen lamps. Color Temperature Light Output and Efficacy Color temperature is a rating used to measure filament temperature, usually in degrees Kelvin (˚K). By definition, color temperature is the temperature at which a black body must operate to produce the exact color match of the filament of a lamp. Color temperature can...

MINIATURE HALOGEN LAMPS—ELECTRICAL LAMPS / ELECTRICAL CHARACTERISTICS Voltage HPX lamps are designed to operate from 2 to 28 volts, AC or DC power. Welch Allyn recommends the use of regulated DC power supplies to yield the best life span. The Rerating Information, shown in Figure 5, shows the relationship of voltage to lamp life. For example, a 10% increase in applied voltage will cause a 70% decrease in lifespan. A 10% decrease in applied voltage will cause lifespan to increase threefold. This clearly shows the value of voltage control and why unregulated AC power supplies are not recommended....

Current Draw Bottom Tip-Off Our standard range of current draw by design is 0.180 amperes to 3.3 amperes. The industry standard for tolerance on current draw is ±10%. One way Welch Allyn ensures product precision is to typically control the current draw to within ±5% of the specified current. The Welch Allyn design specification for current draw of ±5% allows us to produce lamps that significantly outperform lamps with wider tolerances. The tip-off is the area of the envelope where atmospheric air and contaminants are extracted or exhausted from the lamp during manufacture. A secondary process...

Spot Projection The output of a lensed-end lamp can be specified as a spot (diameter) in a plane tangent to the lens and/or a plane perpendicular to the lamp’s cylindrical axis, and at a defined distance from the lens as shown in Figure 8. Some applications require a better control of spot size, spot location and output intensity. Figure 8: Precision Spot Alignment This process provides the necessary mechanical control over the filament placement so as not to compromise the system optics. Better control over the filament position provides a more precise and repeatable system. (See Figure 9.)...

In-Rush Current Durable and Long-Lasting Light The resistance of the filament (tungsten) wire is significantly less at room temperature than when hot during lamp operation. Therefore, when a lamp is energized, there is an initial current surge, commonly referred to as the in-rush current. This in-rush current may exceed the actual operating or steady-state current by as much as 1000% for several milliseconds. (See Figure 10.) There are design techniques that can be used to control the in-rush current. To learn more, please contact our application engineers for more information. The life of Welch...

Figure 11: Wire Terminal Lamps Current (Amps) MSCP (Approx) Envelope Style Life (Hours) Envelope Style: l—lensed end; nl—no lens hemispherical end. All dimensions in mm. 1 Target to lens surface. 9

Figure 11: Wire Terminal Lamps cont’d Lamp P/N Current (Amps) MSCP (Approx) Envelope Style Bulb Dia Life (Hours) (mm) Envelope Style: l—lensed end; nl—no lens hemispherical end. All dimensions in mm. 1 Target to lens surface. Figure 12: Standard Based Lamps Current (Amps) MSCP (Approx) Envelope Style Life (Hours) Base Spot Size 1 Config (mm) (Figure 23) Optical Based (OB) vs. Spot Aligned (SA)

MINIATURE HALOGEN LAMPS—GENERALLAMPS / GENERAL ILLUMINATION LAMPS, /BASED LAMPS LAMPS BASED LAMPS The technical specifications table (Figure 23 on page 21) shows the standard based lamp products offered by Welch Allyn. Our precision lamp design, engineering and manufacturing processes will ensure the desired performance for your critical applications. Should your specifications require a lamp solution not shown in our standard product list, please contact our experienced application engineers. MINIATURE HALOGEN LAMPS— MINIATURE HALOGEN LAMPS / REFLECTORIZED LAMP TYPES, / PARABOLIC & REFLECTORIZED...