Philips 7787XHP (EVD A1/239) - Bi-pin halogen lamp 400 W / 36 V G6.35 for projection and entertainment
The Philips 7787XHP (ANSI EVD , LIF A1/239 ) is a low-voltage, reflectorless halogen lamp designed for projection, studio, and stage applications where a stable beam with high color rendering is required. It features a distortion-free quartz bulb and a precisely positioned filament for consistent optical performance . It delivers a nominal luminous flux of 16,000 lm with a CRI of 100 and a technical color temperature of 3,400 K ( 3,250 K measured horizontally in some datasheets), and has a G6.35 base (often referred to as GY6.35 in the channel). The operating position is S90 (base down to horizontal), and the average life at F50 is 50 hours , maintaining a virtually constant luminous flux throughout its lifespan.
Main features
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Power and voltage: 400 W · 36 V (low voltage) for maximum filament luminance.
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High fidelity light: CRI 100 ; nominal CCT 3,400 K (3,250 K in documented horizontal measurement).
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Stable output: 16,000 lm with virtually constant lumen maintenance.
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Precise construction: UV-open quartz bulb and 9.4 × 4.7 mm flat filament for a clean beam.
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Operating position: S90 (base down to horizontal), ideal for projectors and compact moving heads.
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Thermal management: max. bulb temperatures 900 °C and pinch temperatures 400 °C .
Product benefits
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Color and reference color rendering: CRI 100 and continuous spectrum for cameras and stage.
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Beam consistency: Precisely positioned filament that maintains projection geometry.
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Easy maintenance: G6.35 base for easy insertion and replacement.
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Wide compatibility: Standard bi-pin format for multiple projectors, effects equipment and microscopy.
Use cases (illustrative)
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Projection and effects : OHP/LCD, slide projectors, light effects in clubs and theaters.
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Studio and show : entertainment luminaires that employ 36V/400W halogen capsules.
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Technical applications : instrumentation, microscopy and medical/dental use where a high CRI is required.
Frequently Asked Questions
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Is it dimmable? Yes, halogen lamps are dimmable; keep in mind that dimming lowers the CCT and may affect color rendering.
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G6.35 or GY6.35 base? The official reference is G6.35 . GY6.35 is sometimes used in the industry as a compatible designation.
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Useful life 50 or 100 hours? The official Philips datasheet for the 7787XHP / 50458638 specifies 50 hours (F50) . Some commercial listings mention 100 hours, but this is not stated in the PSS datasheet for the indicated code.
Project description
Philips 7787XHP reflectorless halogen lamp (ANSI EVD , LIF A1/239 ), 400 W , 36 V , G6.35 base, 16,000 lm , CCT 3,400 K (3,250 K horizontal in alternative data sheet), CRI 100 , position S90 ; dimensions: diameter 18 mm , LCL 36 mm ; thermal limits: bulb 900 °C / pinch 400 °C ; life 50 h (F50).
