Cinema Lamp Technology – One Element of Projection ICTA ... · Cinema Lamp Technology, ICTA Jan...
Transcript of Cinema Lamp Technology – One Element of Projection ICTA ... · Cinema Lamp Technology, ICTA Jan...
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Cinema Lamp Technology – One Element of Projection
ICTA MeetingJanuary 2012Paul Ratliff
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Cinema Lamp Technology, ICTA Jan 2012
Cinema History
Carbon Arc for many years!
1954: Xenon cinema lamp Magnetic power supplies, (constant current)
46 years to optimize the system!
2000: Digital cinema Electronic power supplies, (constant power, new suppliers)
Re-designed lamp Still optimizing!
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Cinema Lamp Technology, ICTA Jan 2012
System Driving Factors
Film vs Digital ProjectionA. Overall system efficiencies
B. Aperture sizeC. Reflector
D. Lamp changes
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Cinema Lamp Technology, ICTA Jan 2012
System Efficiency
Conventional Cinema: 100% Reflector, IR-Filter & Lens
Digital Cinema 2D: ~70% Reflector, Integrator & DLP-Chip
Digital Cinema 3D: ~50%
However digital provides other improvements the industry has recognized!
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Cinema Lamp Technology, ICTA Jan 2012
Aperture Size (Interface to optical system)
Type SizeFilm Relatively large, (film frame size)Digital Relatively small, (chip size)
Film
Digital
FLFL
DLDL
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Cinema Lamp Technology, ICTA Jan 2012
Aperture Size (Interface to optical system)
Type SizeFilm Relatively large, (film frame size)Digital Relatively small, (chip size)
Film
Digital
FLFL
DLDL
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Cinema Lamp Technology, ICTA Jan 2012
Aperture Size (Interface to optical system)
Type SizeFilm Relatively large, (film frame size)Digital Relatively small, (chip size)
Film
Digital
FLFL
DLDL
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Cinema Lamp Technology, ICTA Jan 2012
Aperture Size
Ideal lamp & optical system
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Cinema Lamp Technology, ICTA Jan 2012
Reflectors
Conventional Cinema
Digital CinemaProvides 20-25% more light
Digital cinema lamps have reduced bulb diameter & length for improved
optical performance
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Cinema Lamp Technology, ICTA Jan 2012
Lamp Driving Factors
Film vs Digital LampsDigital: Need more light!!!!
A. Higher power (wattage)B. Increased brightness
C. Reduced bulb diameter & lengthD. Additional lamp cooling!
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Cinema Lamp Technology, ICTA Jan 2012
Lamp Driving Factors: Luminous Area
Digital Lamps have: Higher fill pressure More pointed, (sharper) electrodes Shorter arc gap Creates a reduced arc width and length, (reduced luminous area) Results in Higher Luminance (cd/cm2)
Arc Gap
Typical Film Lamp
CathodeAnodeTypical Digital Lamp
Anode Cathode
Arc Width
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Cinema Lamp Technology, ICTA Jan 2012
Film vs Digital Lamps
Lamp Type
Lamp Efficiency (LPW)
Fill Pressure Arc Gap
Luminous Area
Average Luminance (cd/cm2)
Film Baseline Baseline Baseline Baseline BaselineDigital ~same higher shorter smaller ~20% greater
Film lamp luminous area Digital lamp luminous area
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Cinema Lamp Technology, ICTA Jan 2012
Aperture Size
Ideal lamp & optical system
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Cinema Lamp Technology, ICTA Jan 2012
Cinema Lamp Life vs Lamp Power
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Cinema Lamp Technology, ICTA Jan 2012
General Rule, TipsGeneral Rule:
Higher lumens Shorter lifeLower lumens Longer life
Tips:1. Select lamps that will provide sufficient light output throughout
lamp life2. Increase lamp power as lamp dims over life to maintain constant
light output
3. Maintain proper cooling4. Maintain clean & tight electrical connections
5. Clean projector regularly6. Align lamp regularly