UVB Lighting Fixture with Reflector for Safe Vitamin D Production
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Solution Overview
Problem
Vitamin D deficiency is prevalent in urban populations due to limited sunlight exposure, and existing lighting devices that emit UV radiation for vitamin D production are hazardous and not suitable for extended use without medical oversight.
Innovation Solution
A lighting fixture comprising LEDs emitting light in the visible wavelength and UV spectrum with a peak value of 303 nm, combined with a reflector, which provides safe UV exposure levels (AUV ≤ 0.00104 W/m², NUV ≤ 0.00056 W/m², and EUVB irradiance ≤ 0.01004 W/m² at 1.8 m, designed for extended use in office settings to promote vitamin D production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing lighting devices emit UV radiation for vitamin D production, then vitamin D production is promoted, but the radiation emitted is hazardous and requires medical oversight
Solution Approach 1:
The patent changes the UV radiation parameters by using LEDs with peak wavelength of 303 nm and controlling the radiant power to 3.3 mW per LED. The beam angle is optimized to 30° and the fixture is positioned at 1.8 m height, resulting in EUVB irradiance of 0.01004 W/m² which is safe for extended use while still effective for vitamin D production
Solution Approach 2:
The patent introduces an aluminum reflector as an intermediary element to optimize the distribution of UVB radiation. The reflector redirects UVB rays to enhance exposure effectiveness while maintaining safe radiation levels, allowing the system to achieve therapeutic benefits without requiring medical supervision
2Productivity
If UV radiation intensity is increased to enhance vitamin D production, then productivity improves, but safety hazards increase requiring medical supervision
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: UVB LED radiant power (3.3 mW), peak wavelength (303 nm), beam angle (30°), and fixture height (1.8 m). This combination achieves an EUVB irradiance of 0.01004 W/m² that maintains high vitamin D production effectiveness while ensuring safety for extended unsupervised use
Solution Approach 2:
The patent uses 12 UVB LEDs providing total radiant power of 39.6 mW, which is sufficient to achieve therapeutic vitamin D production levels (390 IU in 6 hours) without exceeding safe radiation limits. This partial action approach avoids the hazards of higher intensity while maintaining effectiveness
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 lighting fixture safely provides sufficient UVB radiation for vitamin D production, meeting safety standards and allowing for 390 IU of vitamin D production in 6 hours, without requiring medical supervision, and is compliant with IEC-62471 UV hazard standards.
Implementation Method 1
12 LEDs emitting light in the UVB spectrum having wavelength peak value of 303 nm
Implementation Method 2
one or more LEDs emitting light in the UV spectrum having wavelength peak value of 303 nm
Implementation Method 3
an aluminum reflector
Implementation Method 4
exposing skin to said lighting fixture, wherein said method promotes Vitamin D production
Data Source
AI summary
The present invention provides a lighting fixture comprising a combination of LEDs capable of radiating in the visible wavelengths or UV wavelengths and a reflector to obtain a particular beam angle of light/radiation, features/design of which provides safe levels of UV radiation over a period of time to promote vitamin D production upon contact with exposed skin surface. The lighting fixture of the present invention is particularly suitable for indoor areas such as office spaces, where people spend anywhere from 6-10 hours without exposure to sun, which is a major source of radiation for vitamin D production in the body. The lighting fixture of the present invention addresses the issue of chronic/endemic vitamin D deficiency in the Indian population and provides a cheap, effective and safe way to obtain daily vitamin D dosage and its health benefits.