20-30-50W LEDs

[shuriko]

Hi to everyone!
I've try to find some information about leds like this one:
http://www.kaidomain.com/ProductDetails.aspx?ProductId=8482#

But unfortunately I couldn't find anything. So, if anybody know something about it - please give links or anything else.

P.S. I am from Kiev, Ukraine, so my english not so good as I want to.

 

[blasterman]

Not trying to change your mind, but Bridgelux has a similiarly performing emitter with excellent documentation.

Can't beat the price and shipping of your LED though.

 

[shuriko]

blasterman Thank you very much! Just one little question: is it possible to buy it with PayPal and delivery to Ukraine?

 

[NeSSuS-GTE]

For an answer to that question you will need to contact Farnell Russia. They are the distributor in your part of the world.

Here is the Russian customer support page.
http://ru.farnell.com/jsp/content/freetoair.jsp?content=contact

My guess is that you will get much higher efficacy and reliability from BridgeLux than from those big generic Chinese arrays.

I pushed my BridgeLux array to 4000 lumens with no failure. Look here.

Best of luck!

 

[shuriko]

NeSSuS-GTE Thanks!
I find those LED monsters you talking about (thanks for the link). But price almost twice higher you describe in your post (46 Euro without shipping vs 40 USD).
Thanks to all who help me!

 

[qwertyydude]

Those arrays have terrible efficiency. You could do better by just getting 4 P7 or MC-E leds.

 

[shuriko]

qwertyydude Do you test it or you know it from other sources? Because declared characteristics is not so bad - up to 2000-2200 Lm for 30W. The main problem for me is voltage of P7 is 3,6-3,7V and my power supply will be 12V (11-13,8V) accumulator. If I understand right I will have to made some driver for P7 and I could do my project without driver in case with this 30W led. Correct me if I am wrong, please.

 

[Th232]

Taking those characteristics, and using the upper bound of 2200 lumens, that's ~73 lumens per watt.

Taking, for example, the P7s sold by PhotonFanatic here, 2.8 amps at 3.25-3.5 volts gives us 9.8 watts as a conservative estimate. At 800-900 lumens, that gives us an efficiency of ~81-91 lumens per watt. Way more efficient.

3 P7s in series gives you 9.75-10.5 volts, which is fairly close.

Out of curiosity, why don't you want to use a driver?

 

[Freeze_XJ]

Just that 10-20 more lumens per watt isn't exactly world-changing. If you disagree, what do you call the efficiency of say the Cree XP-E (100+ Lm/W) family?

3-4 of those P7s in series would also keep voltage under control, and allows you to regulate them all at once.

 

[Th232]

Just that 10-20 more lumens per watt isn't exactly world-changing. If you disagree, what do you call the efficiency of say the Cree XP-E (100+ Lm/W) family?

When you're talking 30 watts, that's an extra 300-600 lumens, which I'd say is worth it.

A string of XR-Es or XP-Gs would definitely be better, but shuriko mentioned P7s, which is why I compared those to the array he was looking for.

 

[shuriko]

Big thanks for all answers! Really!
The price of led is important for me too. If one 30W "not good" led will cost 32$, three P7 - about 45$ on DX ...
I am confused. If you don't mind please advise me which led will be better solution as for me even if it will be string of leds from dealextreme.com, because I've already made a few test orders and it's Ok.

 

[qwertyydude]

Oh yeah and one more thing is P7's come in a known color bin. And P7's have a more even color balance with stronger output in the red and yellow spectrum. So better light, more light, and known superior reliability. I think it's worth a few extra bucks.

 

[shuriko]

qwertyydude which LED here http://dealextreme.com/
is the right P7?

 

[aljsk8]

sorry to derail but mce and p7 driven at spec rarely produce 800-900 lumens. 800 max i think (at 2.8a)

 

[RobEU]

Check this webpage:
http://www.maxlitech.com/Products_more.asp?cla=2

I got their price list, for example 300w white LED, model ML-P04W34230018000, cost 110USD ex delivery etc.

 

[clint357]

The Bridgelux isn't too great with efficiency, but it puts out a great flood beam with a 50mm reflector and produces a great color too. I've been driving one at 2.5 amps (over 3,000 lumens) without a problem. As mentioned before, the P7 actually produces 700 lumens on average. 900 is the most they have got in lab conditions.