OSRAM HMI 2500 W/S XS (SFa21-12) – 2,500 W dual-terminal HMI lamp for follow spots and projection in cinema/TV

OSRAM HMI 2500 W/S XS (SFa21-12) – 2,500 W dual-terminal HMI lamp for follow spots and projection in cinema/TV

The OSRAM HMI 2500 W/S XS is a dual-terminal metal halide (SFa21-12) lamp designed for high-performance professional lighting in film, television, theater, and large events. Its short arc and high internal pressure provide very high luminance and daylight-like brightness with a color temperature of 6,000 K and a CRI of 90 , ideal for spotlights, follow spots, and studio projectors. Rated at 2,500 W , it operates at 115 V with 25.6 A (AC) and offers a luminous flux of 240,000 lm with an average lifespan of 500 hours . XS (eXtreme Seal) technology increases the thermal robustness of the clamping mechanism and allows for hot restarts , maintaining stable light output throughout the lamp's lifespan.

Its compact design facilitates integration into OEM equipment and 2.5 kW follow spots. It has a diameter of 31.5 mm , a total length of 210 mm , and a mounting length of 150 mm , with an approximate weight of 150 g . The p30 combustion position (horizontal ±30°) and the requirement for forced cooling are specified by the manufacturer to ensure performance and nominal service life.

Main features

• Power / Voltage / Current: 2,500 W / 115 V / 25.6 A (AC)
• Base: SFa21-12 (double terminal)
• Luminous flux: 240,000 lm
• Color temperature: 6,000 K (daylight)
• Color Rendering Index (CRI): Ra 90
• Nominal average life: 500 h
• Dimensions: Ø 31.5 mm; total length 210 mm; mounting length 150 mm; weight ≈ 150 g
• Combustion position: p30 (horizontal ±30°)
• Hot restart: Yes
• Thermal robustness: XS technology; T _max on base: 450 °C
• Reference luminous efficacy: up to ~100 lm/W

Product benefits

• High luminance and "punch" for long-range beams and sharp cutouts at long distances.
• Natural daylight color (6,000 K) with CRI 90 for skin tones and settings that look true on camera.
• Professional operation : hot restrike and compact design for quick changes and minimal disruption during filming and live broadcasts.
• Durability and stability thanks to the XS sealing and the construction suitable for forced cooling .

Use cases

• 2.5 kW follow spots in theater, concerts and film sets.
• Studio/outdoor HMI projectors for film and TV (key, backlight, dramatic effects).
• Events and touring where maximum intensity and consistent day color are required.
• Solar simulation and technical tests that demand a wide spectrum and high irradiance.

Frequently Asked Questions

Does it need a ballast and igniter? Yes. It must operate with electronic/conventional equipment specified by the manufacturer (ballast + igniter) and with forced cooling .

Is it dimmable? HMI lamps are not dimmable like a halogen lamp with a conventional dimmer. Any adjustment must be made using the ECG provided by the device and within the manufacturer's specifications.

What is the correct orientation? p30 : horizontal operation with a tolerance of ±30°. Respecting this condition prolongs the life and stability of the arc.

Does it produce ozone or require special protection? It emits UV and operates at high internal pressure . It must always be used in enclosed housings with appropriate filters and equipment guards.

Compatibility and installation

• Check on the luminaire: SFa21-12 , 115 V , 25.6 A , space for Ø 31.5 × 210 mm and forced cooling .
• Respect p30 (horizontal ±30°) and the T _max base of 450 °C .
• Installation and replacement by qualified personnel, following HMI safety instructions .

Project description

OSRAM HMI 2500 W/S XS HMI lamp, double terminal SFa21-12 , 2,500 W , 115 V , 25.6 A (AC), 240,000 lm , 6,000 K , CRI 90 , life 500 h , position p30 (horizontal ±30°) , Ø 31.5 mm , length 210 mm , mounting length 150 mm , weight ≈150 g , hot restrike , XS , T _max base 450 °C ; use with ballast/igniter and forced cooling.