Home

Welcome! Log in or Join us

Forums Smart Energy - In the home Halogen 2 LED

Subscribe to Halogen 2 LED 29 posts, 6 voices , Tagged: low energy lighting

Reply to topic
 

 
Samotage_300_medium
Oct 10, 2008 4:55am
555 posts

Has anyone had any experience with low energy LED Lamp replacements for the halogen GU-10 downlights?  I tried replacing one with a Mirabella unit the other week, but have been quite dissapointed by the LED unit.  I know there are better LED options out there and keen to hear of anyone’s experiences!

Sam.

 
Img_0007_medium
Oct 15, 2008 12:42pm
5 posts

I’m about to renovate my house, so I’d like to hear what LEDs work.

Why were you disappointed?  Not bright enough?

 
Samotage_300_medium
Oct 15, 2008 8:56pm
555 posts

I’ve got a set of ayup lights on my bike that have a twin Cree5 LED set, and those puppies pump out so much light it’s staggering – as bright as a car headlight.  I was expecting good performance from the GU-10 LED downloght, but it’s output was a wimpy pale blue pall that was barely enough to read by.  (Later research prooved that the $15 unit was for a reading lamp…)

Anyway, the thing that really sunk my boat was the cluster of 18 LED’suse it soon started failing, first 3 out, then another 3.  Now it runs on just 3 LED’s.  Luckily we only use it for a night light in our bathroom for our little boys. 

It’s dissapointing when you know there is great technology out there, but manufacturers are still delivering crap into the market.  I think that a good LED downlight replacement story would work well here to inform consumers.

Sam.

 

 
Avitar_medium
Feb 14, 2009 6:42am
11 posts

Hey Sam,

It sounds like the resistor is not dropping the voltage properly in your light fixture causing the LEDs to burn out prematurely, you should get thousands of hours of use not a couple of days.

      “It’s dissapointing when you know there is great technology out there,
but manufacturers are still delivering crap into the market”

Screw the manufacturers DIY !!! if you can solder you can build your own lighting fixtures and I am willing to bet they will work much better than the store bought units.

 Here is a link to more LEDs than one should be allowed to have, http://superbrightleds.com/led_prods.htm

I originaly found this on RC Groups but there are many more uses than just lighting up toy airplanes here :)

 Since most LEDs use very low DC voltages one should be able to light up an entire home with less energy use than one regular 5 watt light bulb. The only draw back I can see is the house would need to be wired for LED fixtures to start with or some rewiring would need to be done to take advantage of the energy saving. Better yet throw a solar panel on the roof to charge a battery and have virtually free lighting for years to come.

OT where are the emoticons and the spell check? I can’t live without those :P

Dave

 
Samotage_300_medium
Feb 15, 2009 10:58pm
555 posts

Hey Dave,

Resistor eh?  I will need to get my multimeter out and probe about and ascertain the voltage…  I will do this and report back.

I am planning an experiment and benchmarking of a bunch of LED MR-16 type replacements soon, complete with some fun in the toyshop (carbon will remain on the shelf…).  Thanks for the link to Superbright LEDS, I hadn’t thought of this group, and will add them to the “list” of online suppliers.  Also if anyone else out there has some LED suppliers, please chirp in!

You are spot on with the Solar/LED/Battery thing.  This is my plan exactly – to run a 12V battery power system to run the lights.  A small 40aH battery should be enough to run the lights for days…  It’s just crazy how much energy the halogen MR-16 down lights use – 50W for the light and then 20W for the tranny… nuts.

BTW, you should now be able to enjoy “emoticons” Laughing.  For spell check, if you use a modern browser like Firefox, then right click in the edit box to tell it to check your ’spelln.

Sam,

in need of coffee

 

 

 

 

 
Avitar_medium
Feb 16, 2009 1:55am
11 posts

I should have posted this link as well. Folks will find it after a bit of exploring the Super Bright web site but this will cut down on time for those who prefer to cut to the chase when it comes time to select the resistor need for the application.

http://superbrightleds.com/led_info.htm

 

 
Samotage_300_medium
Mar 7, 2009 10:59pm
555 posts

Hey Dave,

Just checked the electrons, 13.4v AC Surprised.  Henceforth, I was surprised that this is over the rated voltage of the LED, and that it was not DC…  next test to see of the MR16 LED will operate on DC.

Sam.

 

 
Avitar_medium
Mar 8, 2009 2:05am
11 posts

Strange indeed!

 Here is a link with some info but not enough to tell how the bulb is designed to operate

https://www.superbrightleds.com/specs/inches/MR…

I am guessing that there is a transformer built into the base that is supposed to put out DC of the proper voltage to the bulbs, sounds like if that is the case something has shorted between the primary and secondary windings.

 

Dave

 
Avitar_medium
Mar 8, 2009 3:34pm
11 posts

Now you got my curiosity running in overdrive.Cool

 Here is what I have found so far concerning LEDs on AC voltage.

This is web info and should be verified by a qualified electron guru before useWink


 " If you are going to run AC to an LED you always put a diode in
reverse across it(parallel).  That way you will never subject it to
more than ~1V backwards.

Use any old diode; 1N40xx or a 1N4148."

at any rate 13.4 volts is excessive for any LED I can find info on most run at 2 to 4 VDC.

 Now I am going to have to go buy an MR16 just to poke around in its guts with the multimeterSurprised

 

 Dave

 
Avitar_medium
Mar 15, 2009 3:55pm
11 posts

Just found this video on you tube.

Watch the two multimeters left is voltage and right is amperage.

Warning graphic content!!! LEDs were harmed in the filming of this videoSurprised

http://www.youtube.com/watch?v=wO8PdCBejDs&…

I think this is what is going on with your MR16

 Dave

 
Samotage_300_medium
Mar 15, 2009 11:35pm
555 posts

He let the smoke out!

My LED’s aren’t blackened like the ones in this example, and surprisingly some even turned back on the other night!

Sam,

who must get the bulb on the bench.

 
Samotage_300_medium
Mar 23, 2009 11:19pm
555 posts

Well, I tested the MR16 with 6 and 12V DC current.  6V did nothing, whilst te 12V lit up three of the 15 in the cluster, whilst another 3 just flashed stupidly at me.  So it seems they may well work with DC current.  There must be some trickery going on inside as the unit would work (…as good as it could) with the current reversed just fine.

 
Avitar_medium
Mar 24, 2009 2:42am
11 posts

Very interesting!

 LEDs are polarized just as any other diode, they will only allow voltage to pass in one direction. I wonder if theMR16 has half the LEDs using the positive and the other half using the negative side of the AC voltage to reduce flickering. If this is the case it could be that the unit is only working half the time.????

Dave,

 Who is baffled by the test results.

 
Icon_missing_medium
May 11, 2009 11:39am
4 posts

Each LED will have a voltage drop of ~3.5v, and 3 in series would mean that all up it’s gonna need 10ish volts to forward bias and turn them on.

Also, it’s not really the voltage which is the killer factor for LEDs, but the current. The resistor should be in there to limit the current running through the LEDs.
You’ll want about 20mA going through each branch of LEDs, so pick a resistor accordingly.

 
Img_0007_medium
May 11, 2009 12:51pm
5 posts

But the only power source capable of generating 1.21 gigawatts of electricity is a bolt of lightning.

 
Samotage_300_medium
May 11, 2009 11:36pm
555 posts

That’s hillarious Crakers!

 
Samotage_300_medium
May 12, 2009 12:09am
555 posts

Hey aliask,

Would you know thes same stats for the more modern Luxeon or Cree LED’s?

Sam.

 

 
Icon_missing_medium
May 12, 2009 12:28am
4 posts

Luxeon and Cree LEDs are much higher current, and it’s really not ideal using a resistor to limit the current – you’d need to use resistors which are capable of dissipating 4 or 5 watts, and you’re losing all that power as heat from the resistor.
For these high current LEDs you should really use a silicon based current regulator – they’re a bit more expensive, but a lot more efficient and less likely to fry your expensive Luxeons. You might even be able to find some circuits online if you felt like building them yourself.

Cheers, Will.

 
Avitar_medium
May 12, 2009 1:31am
11 posts

Now we are getting some where, just need an electrician to fill in all the details an engine mechanic doesnt know Tongue out

Welcome to  SmartEnergyGroups Will.

 

Dave

 Who doesn’t do trons too well

 
Samotage_300_medium
May 12, 2009 1:39am
555 posts

Hey Dave,

I am ordering a bunch of arduino’s: http://www.arduino.cc/  which will form the basis of the prototype open source home energy management devices being built out for the energy manager application I’ve been working on.  I’m going to have to get better at the soldering, but hey, it can’t be harder than a 6 servo wiring harness right?

Sam.

 

 
Icon_missing_medium
May 12, 2009 8:24am
4 posts

That sounds like a pretty interesting project there Sam… what’s the general gist of it?

 
Avitar_medium
Jul 3, 2009 7:43pm
11 posts

 

Light bulb guts

here are a couple of views of a LED bulb that I am attempting to understand the operation of.

This bulb runs off of 115 VAC @ 60 Hz, when in operation there is no perceptable flicker but when I turn them on I notice a strobe effect in my computer case fans. This leads me to believe that only half of the bulbs are powered at any one time, perhaps the circuitry produces the DC voltage to power the LED bulbs by only using ½ wave AC, not sure as I readings on both AC & DC scales on my multimeter form the exact same test points.

Any one have any light to shed on the subject :)

 
Icon_missing_medium
Jul 4, 2009 2:29am
4 posts

Have you got a bigger picture that I could take a squizz at? Looks like it has a full-wave rectifier on there, so it should be producing solid DC, but I’d like to take a closer look…

 
Avitar_medium
Jul 4, 2009 2:48pm
11 posts

Here is where you can view the full sized pic, I didn’t notice it gets cropped in the posts.

http://www.smartenergygroups.com/Broncomech/pho…

 
Icon_missing_medium
Nov 17, 2011 8:57am
1 post

We are a professional led light manufacturers for Save energy .

Log in to reply to this topic

Forums Smart Energy - In the home Halogen 2 LED

copyright © 2008 Smart Energy Groups pty ltd