Hybrid Halogen LED Illumination Spectral Control
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Solution Overview
Problem
Current illumination systems, such as incandescent and halogen lamps, are inefficient and lack control over correlated color temperature (CCT) and spectral output uniformity, particularly at specific wavelengths, which can lead to shorter lifespan and unwanted color shifts when increasing power to enhance light intensity.
Innovation Solution
A hybrid broadband/narrowband coaxial illumination system that combines a halogen source with a 405nm LED, using an optical waveguide and condenser to align and filter the spectral outputs, allowing for customizable CCT modification without power increase, and providing a flatter spectral output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If halogen light source power is increased to enhance light intensity at specific wavelengths, then light intensity is improved, but energy efficiency deteriorates and correlated color temperature becomes unstable
Solution Approach 1:
The illumination system is segmented into multiple independent light sources, each responsible for specific wavelength bands. A halogen source provides broadband visible light, while separate LEDs target specific wavelengths (e.g., 405nm UV, red, green, blue). This segmentation allows each source to operate at optimal efficiency for its designated spectrum, avoiding the energy waste of over-driving a single broadband source.
Solution Approach 2:
The system changes the operational parameters by using multiple light sources with different spectral characteristics rather than increasing the power of a single source. Each LED operates at its peak efficiency wavelength, and the halogen source operates at a stable, lower power level, collectively achieving high intensity without the energy inefficiency of high-power halogen operation.
2Illumination intensity
If halogen light source power is increased to enhance light intensity at specific wavelengths, then light intensity is improved, but correlated color temperature stability deteriorates
Solution Approach 1:
The spectral output is segmented into discrete wavelength bands, each controlled by an independent LED source. This allows precise control over the spectral composition and correlated color temperature. By adjusting the intensity of individual LEDs rather than increasing overall halogen power, the system maintains stable CCT while achieving the required light intensity at specific wavelengths.
Solution Approach 2:
The system changes from a single-parameter control (halogen power) to multi-parameter control (individual LED intensities). This enables independent adjustment of spectral power distribution and correlated color temperature, allowing the system to maintain stable CCT while enhancing intensity at specific wavelengths through selective LED activation.
3Adaptability or versatility
If RGB LED combination is used to achieve spectral control, then correlated color temperature adjustability is improved, but spectral uniformity deteriorates
Solution Approach 1:
The spectral output is segmented into multiple discrete wavelength bands using separate LEDs for UV (405nm), red, green, and blue regions, plus a broadband halogen source. This fine-grained segmentation provides superior spectral control compared to standard RGB LEDs, enabling both CCT adjustment and spectral uniformity by precisely tuning the intensity of each spectral component.
Solution Approach 2:
The system uses a composite light source architecture combining multiple LED types with different spectral characteristics and a halogen broadband source. This composite approach creates a more complete and uniform spectral output than RGB LEDs alone, filling spectral gaps and achieving both CCT adjustability and spectral uniformity through the synergistic combination of different emission types.
4Adaptability or versatility
If broadband halogen source is used to provide visible spectrum illumination, then spectral coverage is improved, but energy efficiency at specific wavelengths deteriorates
Solution Approach 1:
The broadband halogen spectrum is segmented by adding specific narrowband LED sources at wavelengths where the halogen output is insufficient or inefficient. The LEDs target specific spectral gaps (e.g., 405nm UV, enhanced red, green, blue regions), allowing the system to maintain comprehensive spectral coverage while achieving high efficiency at critical wavelengths by using LEDs instead of relying on high-power halogen emission.
Solution Approach 2:
The system changes the spectral power distribution parameters by superimposing narrowband LED emissions onto the broadband halogen spectrum. This creates a hybrid spectrum that maintains the broad coverage of halogen while adding intense, efficient emission at specific wavelengths through LED peaks, optimizing both spectral coverage and energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves efficient and flexible illumination with improved lifespan and customizable CCT, reducing power requirements and maintaining spectral uniformity, outperforming traditional RGB LED solutions.
Implementation Method 1
an optical waveguide component having an input end and an output end, that is at least partially disposed in the device housing to receive at the input end the first spectral output and the second spectral output
Implementation Method 2
a condenser optical element having an optical axis, mounted in the device housing and disposed to receive the first selected spectral output and propagate said output along the optical axis
Implementation Method 3
the device includes a spectral filter disposed to filters a portion of the broadband source that overlaps the spectral bandwidth of the narrowband source
Implementation Method 4
The tungsten filament of a typical incandescent light bulb has a lifetime of between about 700-1000 hours. Moreover, about 90% of the radiation emitted by a typical incandescent bulb is in the form of heat (i.e., infra-red (IR) radiation) rather than light
Implementation Method 5
the second illumination source has a narrowband infra-red spectrum. In an aspect, the first illumination source is a halogen source and the second illumination source is a 405nm light emitting diode (LED)
Data Source
Figure 1a~1b
Figure 2~3b
Figure 4
AI summary
A hybrid illumination device includes a first illumination source having a broadband spectral output and a second illumination source having a narrowband spectral output that overlaps or lies adjacent a minimum intensity spectral region of the broadband spectrum A halogen source can provide the broadband illumination while a 405 nm LED can provide the narrowband IR illumination The device further includes an optical condenser that collects the broadband illumination and directs it along the optical axis The narrowband source LED can be disposed adjacent the condenser or mounted in the condenser in such a manner that the broadband and narrowband illuminations propagate along coaxial optical paths A waveguide can be provided that collects the hybnd illumination at th device and transmits it to a target scene Target-reflected light may also be collected and transmitted by the waveguide to a receiver/detector