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On the Inside: Philips EnduraLED A19 L-Prize Award Winning Bulb (10A19/LPrize-PRO/2700-900)

Posted on March 20, 2012.

In our first edition of "On The Inside" we take a look at what exactly is inside of the Philips EnduraLED A19 L-Prize Award Winning Bulb. This is a first in what we hope to be a long series of inside glimpses as to what makes today's LED Lighting technology work. We hope you will find this series of articles to be informative as well as entertaining. Without further introduction, lets go inside the Philips EnduraLED A19 L-Prize Award Winner:

First let's take a look at what was originally submitted to the L-Prize competition nearly 3 years ago:

Many hours of testing as well as LED technological advancements later we have this....

This is the final production version of the EnduraLED A19 L-Prize off, as you can see it is a streamlined three light chamber design compared to the original L-Prize submission which used four chambers. You will also notice that the remote phosphor caps are much more yellowish when compared to the AmbientLED 12.5 Watt which is shown below for comparison. 

Just like all of the Philips products that utilize remote phosphor technology the bulb glows soft white when turned on.

So why the shift in color of the phosphor from an orange color to a yellowish tint? Lets open the bulb up to find out:

Removing the phosphor caps reveals the L-Prize bulb actually contains two different looking LEDs. Since the old AmbientLED used royal blue LEDs, could this bulb be mixing colors (Red + Blue LEDs) to achieve its high 92 CRI?

Indeed it does and this also explains the shift in the color of the outside phosphor caps as well.

Digging in deeper, we removed the LED circuit boards and found them to be extremely well built with individual ribbon connectors.

The LED circuit boards are secured to the heatsink with a face plate that ensures a tight bonding to the adhesive thermal interface material.

The heatsink itself is quite high quality and as mentioned before has 3 cavities or chambers where the above LED module assemblies reside.

Deep inside the heatsink resides the main driver board. It is covered in rubber to prevent humming and is very difficult to remove in one piece. We tried unsuccessfully to do so but were still able to remove it fairly intact. Its one of the most elegant drivers we've seen thus far and is primarily built around Cypress Semiconductors CY8CLEDAC03L microcontroller.

The CY8CLED is quite powerful and you can read more about it here at Cypress Semi's Site: http://www.cypress.com/?rID=38553

Other components of note are a main distribution board that exists at the top of the bulb to direct power to each of the main led modules. 

Here is pretty much everything spread out on an 8.5 x 11 sheet of paper. The top right shows some of the capacitors contained inside. All are high quality japanese made rubycon capacitors. Overall, quite an amazing product both inside and out. Easily the best built LED we have seen so far.

If you would like to see a video of the L-Prize in action, check it out below. We hope you enjoyed our first "On The Inside" feature. Stay tuned for our next in the near future.

The Philips L Prize Bulb is now available at EarthLED, click on the Image below to access the product page:


  1. LampShop March 04, 2014

    Thanks a lot for this post,I love reading your blog.

  2. LEDMan October 15, 2013

    Hi Kevan,
    This lamp uses a switching power supply and two channels of constant-current drive to the LEDs (red and royal-blue)to replace a resistive “heater” with most of its output energy in invisible infrared. Add phase-cut dimming- which properly done is incredibly complex (as wall dimmers expect a resistive load, NOT a switching power supply), and a microcontroller is necessary. Some LEDs try to implement dimming without one at the cost of flicker or other instabilities. I know this lamp VERY well. It draws under 10W and puts out more light than the typical 60W incandescent, with excellent color rendering. Every last component is necessary. BTW, ta LOT of them have been running at the DOE for around 3 years now continuously, and from what I hear, the output is 100% of what they started at. You won’t get that in a cheapie LED OR an incandescent. They have come down in cost a lot, and continue to, so wait if you wish. My entire house is LED- so is my car, headlights and all. The future is here.

  3. Jarhead April 05, 2013

    I’ve done additional testing, basic analysis, and a similar teardown:

  4. Wade Carpenter December 30, 2012

    I live off grid and use 12 volt DC lighting. Question 1- Are the individual LED’s in this Phillips bulb 12 volt DC?, Question 2- If so, is it possible to take out the AC converter and make this bulb run on 12 volt DC? Any advice would be great….I like the color and efficiency of this bulb and it would be awsome to have a 12 volt version!

  5. compvter August 11, 2012

    This is probably interesting question for those who don’t live in us. What is the voltage range of these led bulbs? Can i order one that works in europe.

    As for Kevan, i think if you can make better and in the long run cheaper product by designing more complicated product why shouldn’t you do it? Super computers once had calculating power of one basic calculator we have today, that doesn’t mean that i would like to run my windows with that kind of processor speed.

  6. Khalid @ connect lighting May 25, 2012

    I agree with kevin, this is very complicated bulb. But the colour rendition is the best i have seen for led.

  7. Kevan Shaw May 16, 2012

    Isn’t this a totally over engineered solution for a simple lamp? do we really need to build microprocessors into lamps that are more powerful than the navigation computers of the pre-moon shot rockets? It all seems a massive computerised bodge to replicate a very simple piece of wire in a glass envelope!

  8. EarthLED April 18, 2012

    Tom, thanks for your feedback. The bulb itself is manufactured in the USA as per the requirements of the L-Prize itself. Please e-mail us if you have any questions.

  9. Tom Shire April 17, 2012

    Very interesting analysis. I just wish you would discuss where all the components, including the bulb itself, are manufactured, not just the capacitors.

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