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3M announces novel approach to an LED retrofit lamp
28 Aug 2012
A light guide provides omnidirectional light distribution in 3M's new LED-based lamp that is decidedly different from the typical SSL approach to the retrofit application.
Cutaway view of 3M's lamp
Cutaway view of 3M's lamp

This Fall, materials specialist 3M will ship an LED-retrofit lamp that again proves that there is no limit to the number of different ways to apply solid-state lighting (SSL) technology to the problem of designing an omnidirectional bulb. The 60W-equivalent 3M LED Advanced Light uses a light guide that carries and distributes the beam uniformly with the LEDs mounted just above the Edison socket base.

The new lamps produce 800 lm and will be sold in a 3000K CCT version that the company calls soft-white light and a 5000K cool-white version. 3M says that the lamps will last 25 years based on a three-hour usage day and cost $1.63 per year to operate. Retailer Walmart will be the initial source for the $25 lamp with availability expected in September.

The lamp design is truly different from the many other approaches on the market. The approach greatly simplifies the driver design, as the nearby figure shows that the driver is located in the relatively spacious globe. Most other SSL retrofit lamps cram the driver into the base and/or neck of the lamp.

The design allows air to flow into lamp just above the base and exit through slots in the upper half of the globe – cooling both the LEDs and the driver. That thermal concept is again different from most lamps on the market.

LED light engine

The LEDs are mounted facing upwards around the circumference of the neck of the lamp as shown in the figure. The cool-white version uses 9 LEDs while the warm-white version uses 10 LEDs.

A number of 3M materials are used in the lamp including optically clear adhesives used on the globe. The design also uses 3M's Enhanced Specular Reflector material in the light engine. And the design uses 3M electrical connectors.

3M designed the light guide that forms the outer structure of the lamp and uses total internal reflection (TIR) technology to distribute light around the globe. The light-extraction elements are created with white paint on the inside of the light guide causing beams to reflect outside the lamp in an omnidirectional fashion.

The lamp appears similar to a frosted incandescent lamp and is primarily white in the off state. The cooling slots are apparent, but the look would not likely create the issue that say remote-phosphor designs do, with the non-white color in the off state, when lamps are used in fixtures that expose the bulb.

About the Author 
Maury Wright is the Editor of LEDs Magazine.
COMMENTS
Name: stephen   Posted: Tue, 28 Aug 2012 21:08
Very creative design, I can't wait to see an actual lamp.
Name: deamiter   Posted: Wed, 29 Aug 2012 16:08
Cool use of a lightguide to get the light out uniformly. I wanted more details about the construction, but your cutaway view seems broken -- instead of linking to a larger image, it just links back to the article. Could you fix that?

Administrators Reply

Fixed. Sorry for the inconvenience.

Name: ishtiaq   Posted: Wed, 29 Aug 2012 20:08
This is good innovation,looks to be a nice retrofit replacement,however The price of $25 of each bulb is on higher side ,when compared with energy saving CFL lamps,which available $ 1.0.
Name: jvdp.   Posted: Thu, 30 Aug 2012 00:08
Great idea ,does take an large company to spend the $ in development . Wana bet there will be knock off designs within the month ? Good on ya 3M Jv Australia
Name: indygreg   Posted: Thu, 30 Aug 2012 00:08
Neat but why build an incandescent replacement that is not offered in the color of an incandescent (2700k)? There are 5 things an incandescent replacement needs to do. Omnidirectional, 2700k, size and appearance close to a regular bulb, work in an enclosed fixture and be reasonable cost. It seems like every new bulb does 3-4 of them except maybe the lighting science omni 2700k version. It seems to get them all right. Even dispersion, 2700k, doesn't look like a bug light, works in enclosed fixtures and can be bought for $25 which is high but as good as we have today.
Name: majdi hajjar   Posted: Thu, 30 Aug 2012 07:08
Congratulations. Brilliant. My concern is about dust and bacteria accumulating inside the outer shell through the vents and due to thermosiphon of upwards hot flux of air. How can this be cleaned in a practical way? 25 years is I think somewhat exagerated and a marketing trick. Within 2-3 years consumers will be tempted to upgrade to higher lm/w versions and better CRI. So the 25$ will partially go down the drain. We all know that our laptop can last 15 years. Who waits so long to change it? Why stick to the A-bulb shape? I am quite sure that experimenting with other shapes can improve things. Regards. Majdi
Name: zeeman   Posted: Thu, 30 Aug 2012 16:08
Nice design, but 3M forgot that they are building a lightbulb, not a computer. Now look at the design again and think full automation. Well, it is impossible. In order to make LED lamps successful, somebody will have to come with design which can have under $5 cost which translates to sub $10 retail. However, I have to give kudos to 3M engineers for ingenuity.
Name: roboptics   Posted: Thu, 30 Aug 2012 21:08
I'm also curious why it is so important to maintain the traditional bulb shape. Vs the suggested bulb requirements of : 1 - Omnidirectional, 2 - 2700k, 3 - size and appearance close to a regular bulb, 4- work in an enclosed fixture 5 - and be reasonable cost What drives the importance of this shape and where does it rank vs the other 4? How should the other 4 be ranked?
Name: dennis m   Posted: Sun, 02 Sep 2012 23:09
Paraphrasing Monty Python - and now for something completely different an A-19 form factor with odd design , and with flaws already stated and a BOM of what- like 30 components. It looks like yet another rehashing of the flaws of trying to go with DC LEDs and their, driver capacictors et al . You would think the late arrival on to the scene would get us a product that was more contemporary to our times. It strikes me as a reworked 2009 model year luminiare but with a driver location switch a roo. Meh
Name: lewis   Posted: Mon, 03 Sep 2012 01:09
Very nice design. Will it be sold in Walmart China?
Name: marty   Posted: Thu, 06 Sep 2012 18:09
Since it doesn't appear to be dimmable, that, and higher lumen output, would be excellent next innovative steps.
Name: mistero   Posted: Sat, 08 Sep 2012 01:09
Bulbs ARE dimmable but ONLY with the following Lutron units: DVELV-300O, SELB-300P, CTELV-303P, SELVB-300P & VPEO4-ILZ. I purchased 3 bulbs at Walmart for slightly less than $25.00 but my current dimmer (incandescent & halogen only) won't work. I've ordered via Amazon a proper dimmer to install. We'll see.
Name: manish   Posted: Sat, 15 Sep 2012 15:09
Out of box Innovative Design.
Name: zxl914   Posted: Mon, 24 Sep 2012 08:09
Very qute design, I am eager to see the true sample. Is the heat dissipation area enough? Also bulb shape is not the best appearance for SSL.
Name: jason teller   Posted: Thu, 27 Sep 2012 05:09
That design is truly the best designed light bulb on the market , you can always trust 3M products to be innovative and cutting edge. I can't wait to buy this and try it out.
Name: ledlightingguy   Posted: Fri, 28 Sep 2012 20:09
The cool white is actually 4000K, not 5000K as mentioned in the article. This is a very unique design compared to other A19 LED replacements on the market which are more like a snow cone design and dont have a omni-directional light pattern. These are much brighter than other 60 Watt replacements that I have tried. Until lamps are redesigned for LED Light Bulbs, this design is the best energy savings/longer life retrofit to incadescent and much better than CFL.
Name: henryelebrasld   Posted: Thu, 20 Dec 2012 09:12
Kudos to 3M for an innovative design but I believe its time we shy away from trying to convince customers to buy a retrofit bulb that looks like an Edison bulbs. Its a new era of innovation in products and new forms should be sold as replacements that don't take the form of "HISTORY" in lighting. LED's are at the forefront and everyone knows about it and what it can do for our environment, so lets focus on Innovative Forms of LED's
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Author
Maury Wright
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