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View Full Version : Costco 3 LED bulbs in 1 package for $13.00 (solar- generators-shtf)


problemchild
10-14-2011, 6:29 PM
They had low/medium and high Lumen bulbs for 13.99/3 pack. I bought one pack to test out and they are a great color at neutral white. You cannot beat the price and .30 cents per year cost of usage. I do not see them on their website so they must be store only. I shop at the cypress store and they had tons of them. The lows only use 2.5 watts and produce enough light to read and work by just in case.

These would be a great light while using solar or generators.

xgi1991
10-14-2011, 6:33 PM
12VDC or 110AC?

problemchild
10-14-2011, 6:49 PM
standard socket 110v

Not bothering my portable fm radio.

ExtremeX
10-14-2011, 6:52 PM
If we are talking about the same lights here... I used those and returned em... made a low buzzing sound from the AC to DC conversion.

Didn't provide enough light for what I would consider efficient.

You are much better off with a basic DC setup for a SHTF light setup. I have single Cree XML LED on a heat sink that I can run 24/7 off 3.3 VDC @ 1.4 amps using about 4.6 watts and it lights up my entire living room...

Those commercially packaged lights are low performance for what they are. With a little money and some DIY skills you can make some nice battery/solar configuration that would run all day and night.

The peformance is rather impressive for something that uses 4.6 watts. If you are familiar with the Cree XML is very efficent for the output. You can get this LED for around 10 bucks, and can be used to light an entire room with usable light.

The purpose for this build was to retrofit it into my ceiling light... its going to replace a 200 watt halogen light in a ceiling fan in the bed room. Not finished with the project yet...

http://www.calguns.net/calgunforum/attachment.php?attachmentid=118535&d=1318647126

http://www.calguns.net/calgunforum/attachment.php?attachmentid=118536&d=1318647747

Got Stuff?
10-14-2011, 7:30 PM
ExtremeX.....Awesome idea! What would be the best way to diffuse the light though?


Problemchild.....Thanks for the info it's amazing how cheap these things are getting!

k1dude
10-14-2011, 7:30 PM
Very nice ExtremeX. I have a ceiling fan and bathroom light fixture that need more light output, but I'm limited by the lamp bases and envelope provided. Your solution would work for my situation. What are you using to convert the AC to DC? And where did you get the Cree XML for $10? I thought LED's ran cool. Why do you need that giant heat sink and where did you get it?

ExtremeX
10-14-2011, 7:40 PM
ExtremeX.....Awesome idea! What would be the best way to diffuse the light though?


Problemchild.....Thanks for the info it's amazing how cheap these things are getting!

For the ceiling fan I am just going to use the white translucent dome that comes with it... No direct reflector on the LED since all I want is spill to light up a large space.

I also have a couple of nice flashlights that have the ability to tail stand. Even photographers use this method, its call bounce lighting. I have small handheld lights that are able to light up an entire room with this meathod.

If you are trying to achieve any type of throw or focused lighting, you are going to need a reflector. If you take my picture examples, just point them at the ceiling for indoor use.

ExtremeX
10-14-2011, 7:57 PM
Very nice ExtremeX. I have a ceiling fan and bathroom light fixture that need more light output, but I'm limited by the lamp bases and envelope provided. Your solution would work for my situation. What are you using to convert the AC to DC? And where did you get the Cree XML for $10? I thought LED's ran cool. Why do you need that giant heat sink and where did you get it?

Depending on the LED you use, you might be able to direct drive it or you may need a constant current regulation circuit depending on the LED specs and supply voltage...

I have an old Cisco power brick laying around that delivers 3.3V @ a max of 4 amps. In the picture example its a direct drive off this power brick. Just using this for testing...

LEDs need constant current regulation, not constant voltage regulation. So when I turn it into a lamp, I would need something LIKE this...Still doing research

http://www.ledsupply.com/l07u-700.php

The giant heat sink I got from ebay and used it to test the LED. The Cree XML has a max drive current of about 3 amps, and generates a lot of heat... I find 2 amps is pretty optimal. 1.4 amps the lumens to heat is very good. Light output vs amps isn't very linear, especially after 2 amps, 2 amps to 3 amps you are going to be hard pressed if you can see a difference without measurement tools like a light meter. No point feeding it more current and generating heat for that last 2-3% more light.

The LED I bought here.. comes from HK, shipping takes a while but for the price I dont really care. I buy 3 at a times to save a little more.

http://www.dealextreme.com/p/xmlawt-1000-lumen-led-emitter-white-light-bulb-3-0-3-5v-51989

ExtremeX
10-14-2011, 8:08 PM
I cant take direct credit for the ceiling light idea...

I saw it here.
http://www.dealextreme.com/p/30w-2400lm-led-emitter-metal-plate-warm-white-16-18v-47262

http://www.dealextreme.com/feedbacks/browseCustomerPhotos.dx/sku.47262~id.115197

http://www.dealextreme.com/feedbacks/browseCustomerPhotos.dx/sku.47262~id.115194

The reason I'm using the Cree XML is because its efficient and Im a flashlight nut, so its a common LED used in flashlights.

One world of advise... as ive killed 2 of my LEDs so far by over driving them (too much voltage/current), do some research, and having a bench power supply makes testing really handy.

k1dude, look at the pictures and build notes on the above links, it shows an AD to DC converter that was used for this project.

k1dude
10-15-2011, 12:06 AM
Thanks ExtremeX. I forgot to ask which regulator you were using. Fortunately you answered that question. It's hard to choose and balance everything when you're putting it together from scratch. That's why I was asking. It's good to hear you killed 2 LED's so far, because I know the same thing would've happened to me as I tried to figure it all out. If you don't mind, let me know what the final configuration comes out to be and I may just copy your hard work.

Chaparral
10-15-2011, 8:37 AM
Thats one helluva heat sink on that bad boy.

problemchild
10-15-2011, 10:10 AM
My gen is 110v and the lights seem to me an excellent buy at 4 dollars ea.


If we are talking about the same lights here... I used those and returned em... made a low buzzing sound from the AC to DC conversion.

Didn't provide enough light for what I would consider efficient.

You are much better off with a basic DC setup for a SHTF light setup. I have single Cree XML LED on a heat sink that I can run 24/7 off 3.3 VDC @ 1.4 amps using about 4.6 watts and it lights up my entire living room...

Those commercially packaged lights are low performance for what they are. With a little money and some DIY skills you can make some nice battery/solar configuration that would run all day and night.

The peformance is rather impressive for something that uses 4.6 watts. If you are familiar with the Cree XML is very efficent for the output. You can get this LED for around 10 bucks, and can be used to light an entire room with usable light.

The purpose for this build was to retrofit it into my ceiling light... its going to replace a 200 watt halogen light in a ceiling fan in the bed room. Not finished with the project yet...

http://www.calguns.net/calgunforum/attachment.php?attachmentid=118535&d=1318647126

http://www.calguns.net/calgunforum/attachment.php?attachmentid=118536&d=1318647747