Philips 7748XHP (EHJ) - Bi-pin halogen lamp 250 W, 24 V, G6.35 (50 h, 3,550 K) for projection
The Philips 7748XHP ( ANSI reference codes EHJ / LIF A1/223 ) is a low-voltage , reflectorless halogen lamp with a G6.35 base, designed for projection, optics/microscopy, medical and scientific equipment , and entertainment applications. It delivers 250 W at 24 V , with a color temperature of 3550 K , a CRI of 100 , and a 50-hour lifespan . Its UV-Open quartz bulb and precise filament positioning ensure a stable beam and consistent photometric performance. It operates in S90 position (vertical ±90° or base down/horizontal), with luminaire thermal limits of 900 °C for the bulb and 400 °C for the clamp. It provides a nominal luminous flux of 10,000 lm in a compact format (Ø 12.5 mm ; total length 55 mm ), easy to integrate into 24 V heads and projectors.
Main features
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Power / Voltage: 250 W / 24 V
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Socket: G6.35 (bi-pin)
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Type: Halogen without reflector (UV-Open quartz capsule)
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Color temperature (CCT): 3,550K
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Color Rendering Index (CRI): 100
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Luminous flux (nominal): 10,000 lm
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Half-life: 50 h (Life to 50% failures)
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Operating position: S90 (vertical ±90° / base down or horizontal)
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Dimensions: max. diameter 12.5 mm ; max. length 55 mm
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Filament: flat for homogeneous beam
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Luminaire thermal limits: bulb max. 900 °C ; clamp max. 400 °C
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Approximate weight: 0.004 kg
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Applications: projection, microscopy, fiber optics, photo-optics, entertainment
Product benefits
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Maximum color fidelity: tungsten spectrum with CRI 100 and 3,550 K for scientific and scene imaging.
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Stable and efficient beam: flat filament and quartz capsule that improve uniformity and optical collection.
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Easy integration: compact bi-pin G6.35 format, easy to replace in 24V projectors.
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Reliability in service: specified for 50 hours of demanding continuous use.
Use cases
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Projectors and rear projectors: stable source for lenses and gobo systems.
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Microscopy and fiber optics: intense point illumination with constant color.
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Medical and laboratory equipment: continuous light with high color rendering.
Frequently Asked Questions
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Does it need a transformer? Yes, it requires a 24V power supply/transformer suitable for halogen lamps.
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Is it dimmable? Yes, it can be dimmed with compatible dimmers for low-voltage halogen loads.
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What assembly precautions should be taken? Handle with gloves, check ventilation, and respect the thermal limits of the luminaire.
Project description
Philips 7748XHP (EHJ) halogen lamp, bi-pin G6.35 , 250 W , 24 V , 3,550 K , CRI 100 , 10,000 lm , 50 h life , S90 position ; Quartz UV-Open bulb; dimensions: Ø 12.5 mm , length 55 mm ; luminaire thermal limits: bulb 900 °C / clamp 400 °C ; weight approx. 0.004 kg .
