Author Topic: LED light E27 as a lowpower light source  (Read 4504 times)

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ArjenNetherlands

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LED light E27 as a lowpower light source
« on: November 12, 2004, 02:58:34 AM »
Good day Dear Forum members,


I'm Arjen Helder from Holland


a 23 year old electronics engineer


Never before have i enjoyed a site this much! I'm bound to make my own windmill and ill let you know while i work it.


I have made some small sized mills before but failed to find good and Strong magnets

this is about to change!


Also i have browsed the web for good light sources and i found a few Chinese firms that sell led lamps for 220 volt and 12 volt they come in 14/18/22 LEDs per lamp and give allot of light.


The cost is really low they cost about 2.50 dollars a piece!!

and they think the lamps burn about 100.000 hours


This could be interesting for the forum members , so i thought id post it

if you want more info feel free to mail me perhaps if there is enough interest we could place an order at this company.


I have asked for a sample and they will send it to me soon as soon as it arrives ill take photo's to show you the light !


Greetings from the Netherlands!

« Last Edit: November 12, 2004, 02:58:34 AM by (unknown) »

JeroenH

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Re: LED light E27 as a lowpower light source
« Reply #1 on: November 12, 2004, 03:14:37 AM »
Hi Arjen,


Hello there from the Netherlands ;) Always nice to meet a fellow Dutchman.


Those lights sound nice, would you happen to have a link to the website of that company?


Thanks!


JeroenH

« Last Edit: November 12, 2004, 03:14:37 AM by JeroenH »

drdongle

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Re: LED light E27 as a lowpower light source
« Reply #2 on: November 12, 2004, 05:52:09 AM »
How about a URL for that company?


Carpe Vigor


Dr.D

« Last Edit: November 12, 2004, 05:52:09 AM by drdongle »

ArjenNetherlands

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Re: LED light E27 as a lowpower light source
« Reply #3 on: November 12, 2004, 06:06:04 AM »
Here you go guy's!  

http://www.sun-parks.com/sdp/202486/4/pl-1083414.html    


Directly to the products catolog,  please note that this is a b2b company  so buying wont be as eazy.

It could be done but then whe'll have to buy together in bulk.


I hope you find it interesing.    


I also want to note that i have a good idea for pitch control in the propellor  wind turbines but i have to draw it out first.  

And i have a nice idea for a wave power generator   but ill let you all know later  when ive drawn somthing good!


Greetings:  


Arjen Helder


Holland

Amsterdam

« Last Edit: November 12, 2004, 06:06:04 AM by ArjenNetherlands »

ArjenNetherlands

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Re: LED light E27 as a lowpower light source
« Reply #4 on: November 12, 2004, 06:16:05 AM »
forgot to add i have the price list  it varies from 2,50 dollar to 3.70 dollar per lam  it VERRY CHEAP   BUT  it has to bee imported asnd prices are based on a MOQ (minimal order Quantety) of 300 pcs
« Last Edit: November 12, 2004, 06:16:05 AM by ArjenNetherlands »

ghurd

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Re: LED light E27 as a lowpower light source
« Reply #5 on: November 12, 2004, 08:46:44 AM »
Their LEDs are not at all bright by their own claims of 250 to 1800mcd.

Even surplus LEDs are almost always over 4000mcds.

The 'standard' Nichia is about 10,000mcds. That is 5.5 to 40 times brighter.


I have a several LED flashlights, most have 4 LEDs at about 100ma per LED (400ma total!), the LEDs burn out fast (often before the first set of batteries are dead), and the light output is LESS than a single good quality LED at 10ma.  

(BG Micro has photos of a few that I have tested. The silver one is worse than can be discribed.)


My 2 cents is you get what you pay for. If it seems too good to be true...


G-

« Last Edit: November 12, 2004, 08:46:44 AM by ghurd »
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hiker

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Re: LED light E27 as a lowpower light source
« Reply #6 on: November 12, 2004, 12:35:33 PM »
toss a resitor in there...........
« Last Edit: November 12, 2004, 12:35:33 PM by hiker »
WILD in ALASKA

ArjenNetherlands

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Re: LED light E27 as a lowpower light source
« Reply #7 on: November 12, 2004, 12:47:31 PM »
you might be right  and i didnt see the ledslamps  for real yet  but they consist of 14 or 18 or 22  led lights at about 12000 mcd   drawing a power of about 1.3 watts  in total at 22 pcs so i guess its allright.

I have seen pitures that looked nice i just dont know how they adapt it to 220 volts yet  but ill get behind it one day  

i guess the qualety is allright since the give a 2 year warranty


anyway  thx for your reply and have a nice weekend!

« Last Edit: November 12, 2004, 12:47:31 PM by ArjenNetherlands »

ghurd

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Re: LED light E27 as a lowpower light source
« Reply #8 on: November 12, 2004, 06:23:27 PM »
Just some thoughts.  

My job is 35% LEDs.  I didn't try to sell any LED products here. I have nothing to gain from this.  I do love LEDs.


Good LEDs are great. For a small amount of light, or light concentrated in a small spot.


For warrenty, if you import them yourself, you have to pay 2-way forien shipping. Not worth it.  It is very expensive.  My last importation ended up over $11 per pound (about 7 Euros per kg) for 600 pounds.  It is also very difficult to return something made in China, back to China... I have heard almost impossible.

Shipping to the USA would be about $50 for 1 bulb.  Each way.  Best guess.


Also, they claim mcd is only 1200 maximum per LED in their LED section.  The lowest is 250mcd.  Good LEDs are expensive, and much brighter (8,000 to 10,000 mcd).  The only decent LED chip with a mcd over 10,000 have a narrow viewing angle.


For an LED bulb at 220VAC in something at this cost, the regulation is just a resistor.  The lowest current comsumption would be 0.020 amps. That is about 4.5 watts.  Any decent 5 watt CFL would be about the same current, a little more, but many many times brighter than these LEDs.


Anyone with enough of the math skills, time, and patience should compare mcd and viewing angle, with candella or candle power. CFLs win for an area light.  LEDs win for a night light or reading light.  Nothing beats good LEDs in a properly designed flashlight.


G-

« Last Edit: November 12, 2004, 06:23:27 PM by ghurd »
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ghurd

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Re: LED light E27 as a lowpower light source
« Reply #9 on: November 12, 2004, 06:30:17 PM »
Also.

White LEDs last about 30-50,000 hours until they reach half brightness, but only if they are driven at a lower current than specified (about 20ma).  The phospher degrades, lowering the output.  When driven at a higher current the phospher degrades much faster, lowering the output hours exponentially.


And sorry about the spelling.  I speak math ;)


G-

« Last Edit: November 12, 2004, 06:30:17 PM by ghurd »
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ToddH

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Re: LED light E27 as a lowpower light source
« Reply #10 on: November 12, 2004, 09:26:07 PM »
I bought a few 30 LED bulbs with the 1156 base from "superbriteleds.com" almost a year ago, and quite frankly the quality of the cheap LED's from China is poor.  


They were fine for the first few months, then they started to flicker in different color spectrums.

Now in the last two months, in groups of three, the LED's have started to burned out.


Also, the light output is pretty low, even with 30 LED's. They are fine as night lights to keep you from stubbing your toe walking around the house at night, but I was expecting more useable light.


I hope you have a better experience than I had with them.


I may give the luxeon LED's a try in the near future.

« Last Edit: November 12, 2004, 09:26:07 PM by ToddH »

drdongle

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Re: LED light E27 as a lowpower light source
« Reply #11 on: November 13, 2004, 06:50:02 AM »
 Obviously this is sill a maturing technology.


Carpe Vigor


Dr.D

« Last Edit: November 13, 2004, 06:50:02 AM by drdongle »

bob golding

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Re: LED light E27 as a lowpower light source
« Reply #12 on: November 13, 2004, 07:08:49 AM »
hi ghurd, took your advice and put 3 leds in series with a 270 ohm resistor. i have got 9 strings of 3 which gives a good enough light to read by and as general background light it draws 172 mA at 13.8 volts 2.3 watts. does that sound about right ?


bob golding

« Last Edit: November 13, 2004, 07:08:49 AM by bob golding »
if i cant fix it i can fix it so it cant be fixed.

wooferhound

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Re: LED light E27 as a lowpower light source
« Reply #13 on: November 13, 2004, 10:21:21 AM »
LED Series Resister Calculator

http://ourworld.compuserve.com/homepages/Bill_Bowden/led.htm

and other cool stuff
« Last Edit: November 13, 2004, 10:21:21 AM by wooferhound »

ghurd

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Re: LED light E27 as a lowpower light source
« Reply #14 on: November 14, 2004, 10:17:59 AM »
Yes.  There is still 19ma / LED, so it should be just as bright as it was, but much more efficient.  Also, good quality, wider angle LEDs are generaly a hair more efficient, and nicer for reading too.


Hows the peltier setup coming?


G-

« Last Edit: November 14, 2004, 10:17:59 AM by ghurd »
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ghurd

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Re: LED light E27 as a lowpower light source
« Reply #15 on: November 14, 2004, 10:20:47 AM »
Avoid the 'high power' LEDs if you want any efficiency, or light quality.  They make less light than a quality 'regular' bulb of the same current.

G
« Last Edit: November 14, 2004, 10:20:47 AM by ghurd »
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ghurd

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Re: LED light E27 as a lowpower light source
« Reply #16 on: November 15, 2004, 12:58:22 AM »
Not so much maturing.


Mostly trying to make money with poor designs and poor LEDs, and greatly overdriven poor LEDs.

A 25 cent #1156 is really bright at 48 volts! For a second or 2.


Good LEDs can be made bright and efficient, its just not cheap enough to do it for most grid people, compared to other things. People want brighter than what they have, and cheaper. Case in point: Why doesn't everyone use CFLs?  Because they can be had 4/$1, while the CFLs are still over $3 each.


And it is much more complicated to make a truely efficient LED bulb for 120 or 220VAC.   LED bulbs are much more suited for 12 to 48 VDC systems.


It is better to build them yourself with a good design and good parts.


Am I on another 'rant'?


G-

« Last Edit: November 15, 2004, 12:58:22 AM by ghurd »
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