LED streetlights "down under"

Looks pretty impressive....wonder what LEDs they`re using, and how much it costs?!


Actually I thought the world`s first all-LED street lamp was in Holland someplace, using prototype high dome Luxeon Star LEDS with Promethius dies- amber ones. And I believe Osram has dome something similar too with their own brand of LED, though I know next to nothing about Osram`s LEDs so can`t say for sure. I do know they did a trial installation of white LED lighting in an office floor.


I have some all-LED garden lights. Does that count?
grin.gif


shocked.gif
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Stingmon:
Claims to have installed the world's first all-LED streetlamp<HR></BLOCKQUOTE>

There is a street lit by LEDs somewhere close to Phillips in Holland (Eindhoven?)
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Chris M.:
though I know next to nothing about Osram`s LEDs so can`t say for sure<HR></BLOCKQUOTE>

Osram's white LEDs are based on the Cree die and they just sued Nichia that they already have patented the LED die + phosphor idea some time ago (but they basically wanted to include the phosphor into the LED's epoxy).

The Cree die has the highest quantum efficiency now from all production dice (AFAIK).
 
Nichia's method is to apply a relatively thin layer of phosphor in slurry form over the die & die cup, while other manufacturers have tried incorporating the dry phosphor powder in a portion of the epoxy encapsulant itself using various methods.

Take a close look at a Nichia, and at one of those 10mm Hosfelt whites. Run half a milliamp through each, and observe under strong magnification - the difference will be apparent.

But that is a seperate patent altogether.
As for the very *idea* of using a blue LED & phosphor together, I'm not qualified to comment on that, as I simply don't have the facts of the lawsuit at my disposal.
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Stingmon:

Take a close look at a Nichia, and at one of those 10mm Hosfelt whites.
<HR></BLOCKQUOTE>

Have you compared the 10mm Hosfelt with the
5mm Nichia? Is the 10mm significantly
brighter? Whats your opinion on this?
I wasnt able to get any to try yet.

--Al
 
Have you compared the 10mm Hosfelt with the
5mm Nichia? Is the 10mm significantly
brighter? Whats your opinion on this?


I wouldn`t bother with them- to quote everyone`s favourite reviewer (the mighty Stingmon), they`re "pieces of (Vulgar term for Feces)" . I`ve got a bag of them here somewhere, got no idea where though any more. Under a pile of something, that`s for sure.

Nichia`s little offerings are significantly better, they are brighter at the rated current, and respond much better to overdriving too, as we all know
smile.gif
. Feed 50mA into one of them 10mm ones and it will probably just fry, certainly isn`t much brighter than at 25mA.


The only good thing with those 10mm ones is you can stick them right up close to your eyeballs and peer into the top- and see the internal structure very clearly without using specially modified (and currently missing-in-action) ex CCTV cameras.

Interesting though.....

shocked.gif
rolleyes.gif
grin.gif
 
i was unimpressed by the 10mm white led i have here.
looks like they simply encapsulated a normal 5600 diecup into a 10mm body.
mad.gif
mad.gif
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Stingmon:
Nichia's method is to apply a relatively thin layer of phosphor in slurry form over the die & die cup
<HR></BLOCKQUOTE>

Osram holds US patents US 6,066,861 and US 6,245,259 and a German one.
I do not know in depth what they contain.

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>
Take a close look at a Nichia, and at one of those 10mm Hosfelt whites. Run half a milliamp through each,
<HR></BLOCKQUOTE>

It also can be seen at higher currents (with a filter).
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by kc8adu:
i was unimpressed by the 10mm white led i have here.
looks like they simply encapsulated a normal 5600 diecup into a 10mm body.
mad.gif
mad.gif
<HR></BLOCKQUOTE>

Oh ok thanks. They were claiming something
like 7000mcd so that caught my attention.
So they really arent 7000mcd then you think?

--Al
 
So they really arent 7000mcd then you think?


I think they probably do come close to that figure- I`d meter one myself now but for 2 things- it`s daytime here right now (about 2PM and there`s no dark windowless room I can use either) and the LEDs themselves are all in a little bag buried under some pile of junk someplace round here
shocked.gif



Thing is- Nichia`s LEDs, the way we all like to drive them (ie, Overdrive) put out a lot more than 5600mcd. An Infinity torch, er sorry, Flashlight
wink.gif
puts out just under 6000mcd (well mine does)- and that`s a fairly dim light, right? But the Arc-AAA probably gives 14000 or 15000mcds cos of the overdriving of the LED- making a bright light. Those big LEDs, because of the different way the phosphor is applied and possibly because of a different die structure too (I can`t remember if it`s a cube shaped Cree single wire bond type in there), do not respond well to overdriving so you`d be lucky to get maybe 8000mcds from one, pushed as hard as it`ll take- maybe 30-40mA.

Remember, also, that the beam is narrower (which means more mcds from less Lumens)- I seem to remember it is oval shaped and about 10x8 degrees, with a sharp fall-off, not the wider smooth gradient of the Nichia 5mm type.

As an LED enthusuast, they`re interesting. But that`s all, really. Nichias are the best bet for lighting purposes, well aside form Luxeons of course.


tongue.gif
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Chris M.:
Thing is- Nichia`s LEDs, the way we all like to drive them (ie, Overdrive) put out a lot more than 5600mcd.<HR></BLOCKQUOTE>

Hey, not ALL!
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by MrAl:
Have you compared the 10mm Hosfelt with the
5mm Nichia? Is the 10mm significantly
brighter?
<HR></BLOCKQUOTE>

The 10mm one bites.
I posted pictures last spring or summer...wonder if they're still on here.

--------------------------------------------

25-367.jpg


Picture was deliberately underexposed to try and capture the distinctly bluish center.

In reality, the beam consists of an elliptical central hot zone, bright cyan in color, surrounded by a much weaker, white coma. It looks like a comet without its tail.

Measured 10.6 foot-candles from the distinctly bright cyan central beam area.
 
Top