Rail Vehicle LED Emergency Lighting Glare Reduction
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Solution Overview
Problem
Existing emergency lighting in rail vehicles using LEDs often causes glare due to the high luminance of LED lamps, which is unacceptable according to EN 13272 standards, especially when only some lamps are operational during emergency lighting.
Innovation Solution
All LED light sources in rail vehicle passenger compartments are supplied from different emergency lighting circuits, and their luminosity is reduced when switching to emergency lighting mode, maintaining the same light distribution and allowing for flexible transitions between main and emergency luminosity levels, with the electronic ballast integrated to manage voltage and reduce intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If only some lamps are operated during emergency lighting, then energy consumption is reduced, but glare effect increases
Solution Approach 1:
The patent combines all LED light sources into a single emergency lighting system where all lamps operate simultaneously during emergencies, merging their contributions to create uniform illumination that avoids glare while maintaining energy efficiency through the battery-powered emergency circuit
2Object-affected harmful factors
If LED luminosity is reduced during emergency lighting, then glare effect is minimized, but illumination intensity decreases
Solution Approach 1:
The patent changes the luminosity parameter of LEDs during emergency lighting operation, reducing it from normal levels to an optimized level that provides sufficient illumination for safety while eliminating glare effects, with the ballast dynamically adjusting the operating parameters
3Stability of the object's composition
If all LED light sources are used for emergency lighting, then uniform light distribution is maintained, but energy demand increases
Solution Approach 1:
The patent makes all LED light sources multi-functional, serving both as normal lighting and as emergency lighting, allowing the same infrastructure to provide uniform illumination during emergencies while the battery-powered design ensures energy demand is managed appropriately for safety requirements
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
This approach provides glare-free emergency lighting, ensuring passenger spatial orientation without blinding effects and ensuring continuous energy supply through the emergency power system, with the added benefit of maintaining relative light distribution and flexible luminosity transitions.
Implementation Method 1
an electronic ballast that provides the required (low) operating voltage
Implementation Method 2
light-emitting diodes (LEDs) have recently become the preferred light sources
Implementation Method 3
The high energy efficiency of the LED is also reflected in low heat development
Data Source
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AI summary
The invention relates to rail vehicle emergency lighting for a rail vehicle, comprising a main lighting unit composed of light-emitting diodes, wherein, when the main light power supply (HL) is active, all the luminous elements of the main lighting unit are illuminated with a main light intensity (HLS) and, when the main light power supply (HL) is absent, all the luminous elements of the main lighting unit are illuminated with an emergency light intensity (NLS).