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Mar 24, 2009
Avitar_medium Broncomech 11 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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.

 
Mar 23, 2009
Samotage_300_medium samotage 555 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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.

 
Mar 22, 2009
Samotage_300_medium samotage 555 posts

Topic: Renewable Energy / New thin solar cell technology

Cool site, those flexy films sure look destined for other applicaitons.  I ran numbers on a 5kW panel, and it came out a whopping $82,000 (though I am sure they could do a “discount”…)   So it seems that this brand praps isn’t quite there yet, but I keep hearing promising stuff in the space. 

 
Mar 22, 2009
Avitar_medium Broncomech 11 posts

Topic: Renewable Energy / New thin solar cell technology

Here is one example of film type solar cells. Hopefully the type DavidMc posted links to will hit the market soon.

 

http://www.solar-world.com/PowerFilm.htm

 
Mar 15, 2009
Samotage_300_medium samotage 555 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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.

 
Mar 15, 2009
Avitar_medium Broncomech 11 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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

 
Mar 8, 2009
Avitar_medium Broncomech 11 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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

 
Mar 8, 2009
Avitar_medium Broncomech 11 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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

 
Mar 7, 2009
Samotage_300_medium samotage 555 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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.

 

 
Feb 16, 2009
Avitar_medium Broncomech 11 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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

 

 
Feb 15, 2009
Samotage_300_medium samotage 555 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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

 

 

 

 

 
Feb 14, 2009
Avitar_medium Broncomech 11 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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

 
Feb 12, 2009
Samotage_300_medium samotage 555 posts

Topic: Transportation / Smarter and cleaner air travel?

Remarkable! 

I read Qantas is strategically moving towards these monster planes for the London/Aus route because:

  • There are limited flight slots – 4 per day based on windows for take off and arrival
  • More passengers per plane means they can grow their market within the above constraints
  • The fuel burn is lower per passenger, and in a peak oil world, economy will become an absolute imperative (like it’s not now…)

I suspect they will ditch the lounges/cabins and in usual Qantas style pack in the sardines like the budget airlines are doing in Europe with the big uns.

Perhaps the big question in my mind, is what will happen to air travel when the oil runs out?

Sam.

 
Feb 2, 2009
Icon_missing_medium Carbonfibre 2 posts

Topic: Transportation / Smarter and cleaner air travel?

 

I note with interest the new Emirates Airbus A-380 arriving into Auckland for its first scheduled flight today. Being a pilot – and interested in these things got me thinking about energy efficiency and practicality….

Some specs to ponder:

  • The Emirates A380 burns up to 20% less fuel per seat than today’s largest aircraft
  • This is the most significant advancement in reducing fuel burn and emissions in four decades
  • Low
    fuel burn means lower C02 emissions. The Emirates A380 produces less
    than 75g of C02 per passenger kilometre, almost half of the European
    target for cars manufactured in 2008

Company hype – or a real step forward? FWIW, it is only 50% as loud as a 747 on takeoff. Your thoughts?

 
Jan 27, 2009
Samotage_300_medium samotage 555 posts

Topic: Comments and Suggestions / A new look and feel

The site’s front page has just had a makeover to highlight important new articles, and provide a better experience.  Let us know your comments, ideas and suggetions.

There are many things planned for this year, so very keen to hear everyone’s input and suggestions.

 
Dec 18, 2008
Samotage_300_medium samotage 555 posts

Topic: Smart Energy - In the home / advice to newbee

Hey knightm!

Welcome to Smart Energy Groups, and thanks for joining up!

Sounds to me like you’ve got a top smart energy project on your hands there, and something that seems like it could be a really good model for this community to learn from.

There are a heap of new developments occuring in the solar space right now that look like being cheaper and better than silicon.  These are heading down the path of alternates like cadmium tellurium as the key ingredient to convert sunlight into electricity.   First Solar in the US has just implemented a project in Nevada where the cost of the solar kicks coals arse, 7.5 cents to 9 and looks to me the future.  So hold off until the new gear gets up and going.  Sheet loads of VC money is heading in this direction to expect big results.

In my opinion, I’d be insulating as much as possible, the more the better.  Certainly put the heavier batts in your northern walls.

For downlights, I am very keen to learn more about the current generation of LED lights, which are awesome.  I’d be wiring them all up on a central 12V circuit with 12 lead acid batteries, charged by the areforementioned solar system.  The halogen units just make more heat than they are worth, with 70+ watts apeiece (including light and transformer) it’s a sad fact there are so many about.

Keep us posted on what you learn!

Sam.


 
Dec 17, 2008
Icon_missing_medium knightm 1 post

Topic: Smart Energy - In the home / advice to newbee

Hi all,

Newbee here – followed a link from davidmc over at somersoft.com property forums.  Impressed to see this site up and running, looks great.  About me – I am lving in NSW OZ fairly new to the energy thing but keen to make a difference if I can.  In particular my wife and I are looking to buy land and build a new home in 09 – so I want to do it as energy efficient from the start as I can.  We are looking at basic project home setups as a base, but trying to tailor the floor plan and aspect to ensure we have a decent passive solar outcome. (long east west, bedrooms facing south, living areas facing north with lots of large north facing window, minimise the window sizes in all other directions. 

My questions are more about technology in its various forms and how they will effect things. 

1 Can I do a solar panel setup and have it finacially viable in reasonable timeframe? How?

2 How much difference will there be if I put it insulation batts rated at 5 in the roof (rather than standard 3.5) and say 3.5 in the walls (rather than 1.5)

3 What is the best lighting setup (we love downlights but unsure which is the best type for power usage etc)

4 Any ideas on different types of solar hot water setups?

Thanks if you can point me in the right direction to access this info its really appreciated.

 
Oct 15, 2008
Samotage_300_medium samotage 555 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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.

 

 
Oct 15, 2008
Img_0007_medium DavidMc 5 posts

Topic: Smart Energy - In the home / Halogen 2 LED

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

Why were you disappointed?  Not bright enough?

 
Oct 10, 2008
Samotage_300_medium samotage 555 posts

Topic: Renewable Energy / New thin solar cell technology

I’m hoping this kind of technology moves to drive the cost of solar down.  Recently I read that similar new tech solar can deliver energy for 10c per kWh, a huge drop in cost compared to ultra expensive current silicon based solar technology.

 

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