NATURAL LIGHT FOR 95% CRI INDEX LED PROJECT

DOME LAMPS FOR AUTOMOTIVE & READING LAMP FOR HOME / OFFICE

Design HMI has completed application design for next generation feature innovation reading lamp and dome light. Potential applications are:

Basic Feature Design Specifications as below:

Final Design Color Adjust 95% CRI White Light Modules – Auto & Home

Design HMI Next Generation Dome Lamp for Auto and Home with Smart Color Tuning Light Module offering you White Light color temperature that best suits your needs or time of day.

White Light Color Tuning from Warm (2000K) to Cold (5500K) with dimming capability. Target 95% of Natural Light Spectrum to provide illumination based on natural light and adjustable to time of day and different interior fabric / trim color renderings.

A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source. A high CRI is desirable in color-critical applications such as neonatal care and art restoration. Refer https://en.wikipedia.org/wiki/Color_rendering_index

The target here is to achieve CRI Index at all temperature settings of 95% to 97% between color temperature setting of 2000K to 5500K.

Design HMI has completed concept design phase. Final production intent prototype will have two designs:

1. In car Pick and Place Dome Light application – intensity 55 Lumens.
2. Ideal for autonomous vehicles on long drives.
3. Table light – intensity 150 to 350 Lumens.
4. Five color temperature settings.
5. All concepts to be wireless with 8-hour life rechargeable battery life.
6. Wireless controller to turn light ON / OFF, adjust color and lighting intensity.
7. Table Light module to be designed to integrate with standard off the shelf lamp shades.

10/06/2017 Update: Completed Concept Design for Color Temperature Adjust White Light

95% CRI Index to Natural Light

A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source. A high CRI is desirable in color-critical applications such as neonatal care and art restoration. Refer https://en.wikipedia.org/wiki/Color_rendering_index

The target here is to achieve CRI Index at all temperature settings of 95% to 97% between color temperature setting of 2000K to 5500K.

Design HMI has completed concept design phase. Final production intent prototype will have two designs:

1. In car Pick and Place Dome Light application – intensity 55 Lumens.
2. Ideal for autonomous vehicles on long drives.
3. Table light – intensity 150 to 250 Lumens.
4. Five color temperature settings.
5. All concepts to be wireless with 8-hour life rechargeable battery life.
6. Wireless controller to turn light ON / OFF, adjust color and lighting intensity.
7. Table Light module to be designed to integrate with standard off the shelf lamp shades.

Challenge: Cost target to meet lighting luminaire and high quality in car dome / ambient light business case

CLICK following for other references:

• Natural Light / High CRI Index LED Lighting for Natural in Door Lighting Color
• Smart Lamp with 5 Natural Light Settings

September 7^th, 2017 Update:

Below is the 2^nd iteration of adjustable white light from 2000K to 5500K targeted to meet 95% of CRI index using Yuji LED’s. Once this design prototype is validated for functionality will move towards production intent design prototype.

The earlier prototype lighting intensity was 40 Lumens which is enough for Automotive Dome Lights but too low for interior reading lamps. Want to validate design where LED intensity can be 40 Lumens for Automotive and 400 Lumens for desk reading lamp.

As per the circuit diagram initial PCBA samples developed with 6 Yuji LED’s on each circuit with help from Microchip. Current design is to validate lighting intensity and only has a selector switch to select LED color – from 2000K to 5500K.

All 6 LED’s are designed to meet 95% of natural light CRI Index.

Final design will incorporate a dimmer and ON / OFF button.

The other prototype being developed with OSRAM will use 12v power input using common adaptor available from Amazon / eBay and others as below.

The key target is that intensity should be 400 to 500 Lumens so can demonstrate adjustable white lite solution as good fit both for home and auto interior.

Yuji LED Circuit Design as Developed by Microchip for Settings

2000K to 5500K

Below is base reference design for LED’s from Yuji LED – https://www.yujiintl.com/about.

The circuit design developed has been kept very simple for initial concept validation working with Microchip Electronics.

Design HMI Next Generation Dome Lamp for Auto and Home with Smart Color Tuning Light Module offering you the to White Light color temperature that best suits your needs or time of day.

White Light Color Tuning from Warm (1800K) to Cold (6500K) with dimming capability. Target 95% of Natural Light Spectrum to provide illumination based on natural light and adjustable to time of day and different interior fabric / trim color renderings.

For the last three to four years Design HMI LLC has been investigating adjustable white light for car interiors and homes targeted to 95% of natural light CRI Index. Lumenetix has been developing tunable white light for commercial applications for some years. Design HMI LLC, in collaboration with OSRAM and MICROCHIP is working to develop solution suited for Automotive Interiors and Home usage.

Smart Color Tuning Light Module offering you White Light color temperature that best suits your needs or time of day. Also designed to highlight in car trim and / or home interior color selection.

White Light Color Tuning from Warm (2000K) to Cold (5500K) with dimming capability. Target 95% of Natural Light Spectrum to provide illumination based on natural light and adjustable to time of day and different interior fabric / trim color renderings.

 

As you know light perceived as yellowish with color temperature of around 2700K; at color temperature of 3000K – 3500K it appears less yellow and more white. At color temperature of 5000K or higher the light produced appears bluish white.

At 2700-2800K desired lighting effect is “warm” and temperatures above 5000K simulate Daylight

Some customers may prefer warm lights and others colder white color – preference is also based on interior choices. In some hotels you can already mood lighting with touch of an iPad or via control switch on the wall. This feature is already provided to control RGB Ambient Lighting in cars.

The other design deliverable is to develop LED lighting that which mimics natural sunlight as much as commercially viable – 95% of the CRI Index which is measure of the ability of a light source to reproduce colors of various objects compared to an ideal light source. On scale 0-100 lights closer to 100 have an ability to show truer colors.

Per recent WSJ Article as quote on ‘ How to Bring the Sun Indoors’ researchers are looking at how dialing up and down the brightness, color and richness of household lighting can help regulate our circadian rhythms. These rhythms—the mental and behavioral changes that occur in response mostly to light cues over each 24-hour period—affect hormone releases, body temperature and the sleep-wake cycle, according to the National Institutes of Health. Studies have connected circadian-rhythm disruptions with obesity, depression and diabetes. Better lighting also lifts our moods and improves our quality of life, researchers say.

The final design is to integrate component technology with solid state electronics in conjunction with latest in light guide technology and materials – like those from DOW Silicones.

Will have more information as the design progresses. For more information on natural light in commercial applications please click http://www.lumenetix.com/

Another potential application is Headlights Temperature Adjust White Headlights Meeting 95% Natural Light CRI Index

Adjustable White Color Headlight lighting color temperature from 2000K to 6500K that meets 95% of Natural Light CRI Index

Ledzworld has developed MR16 Chameleon LED lamp with CRI of 98. CRI (color rendering index) is a measure of how accurately a light source illuminate’s objects’ true colors. With CRI values of up to 98 LED lights are able to produce white light that approximates halogen or incandescent lighting and natural daylight.

The near perfect CRI ensures Ledzworld’s new MR16 lamps render objects naturally making them an ideal choice for efficiently illuminating retail stores, restaurants, hotels, museums, art galleries, and homes.

With their Chameleon driver and Color Temperature Adjustment (CTA) 2.0 technology.” The lamps will be available in a variety of beam angles including a very narrow spot-beam often requested for retail store applications. 10°, 25°, 40° and 60° are standard and customizations are available upon request.

The company’s innovative Chameleon driver is a technological breakthrough that adjusts itself to its environment by first detecting the transformer type, then analyzing its waveform and finally adjusting itself to make a perfect electrical fit with that particular transformer. This feature makes the MR16 Chameleon retrofit lamps truly “plug and play” devices that can be used in a wide variety of the possible combinations of commonly used drivers and dimmers

Utilizing Ledzworld’s CTA 2.0 technology, the high CRI LED MR16 Chameleon lamp perfectly emulates the color tones of halogens when dimmed. www.ledzworld.com.

The other company is Yuji (http://www.yujiintl.com/high-cri-led-lighting) which began producing LED phosphor material in 2006. They focused on red phosphor technology, a necessary addition to any LED phosphor recipe for high CRI and/or low CCT, which at the time represented a small, yet rapidly growing market opportunity.

Two More Natural Light Design Concepts

Progress on Adjustable White Light as of June 17^th:

The first prototype was developed with support from OSRAM and Microchip. Picture from early prototypes as below.

The key design targets are:

• Lighting intensity 350 Lumens.
• Adjustable light color temperature from 2000K to 5500K.
• Meet natural light CRI Index of 95% at some key temperature settings.

Based on initial analysis design needs to be improved:

1. Increase power to achieve higher lighting intensity.
2. Go to 10 LED design over 5 LED to get to 350 Lumens Lighting Intensity
3. Develop lens with higher translucency to keep light loss to minimum.

Hope to validate achieve lighting design requirements and then complete design with other key deliverables next 60 days. Other key design deliverables are:

• Wireless design with minimum 6-hour power pack.
• Wireless charging.
• USB cell phone charging ports.
• Proximity detect with soft ambient light ON.
• Touch ON / OFF feature with color temperature controls.
• Dimming capability.

_____________________________________________________________________

Industrial Design confidential to Design Hmi LLC by IDEATION Group – Michael Boyd

•  Wireless control – both with remote and through smart phone.
• Wireless controller to turn light ON / OFF, choose between 5 light settings and intensity dimming.
• Setting are early morning light, MID day, early evening, before sunset and candle light.
• LCD clock with alarm – wake you up to early morning theater ON natural light setting.
• Proximity detect to light up lamp controls – ease to view at night.
• LCD state Display on lamp.
• Wireless and USB cell phone charging in base of the lamp.
• Stand to adjust lighting position for reading and for providing natural lighting during makeup.
• Designed with rechargeable battery in case of power failure.
• Power connection from wall socket through USB port or other – complete with inverter.

Smart light lamp with lighting color rendering index (CRI) 90+. Color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source.

CRI of an illuminant affects color appearance of objects by conscious or subconscious comparison with their color appearance under a reference illuminant – the highest possible is 100 (Sun Light).

Lamp is beautifully styled with Algra high end decorative lamp stand with look and feel of a high end luxury product – aluminum milled, glass bead blasted, possibly with a decorative grinded pattern, anodized and colorized.