12V LED Incandescent Replacement

Look at these guys -

http://mkdigitaldirect.com/products/led-lighting/iclex-led-showcase-lighting-jewelry-stores.html

eg

sorry but unable to get link to work.

but if you cut it down it works, try this

http://mkdigitaldirect.com/

this ones good and even has a scale for kelvin colour temp

http://www.bltdirect.com/search.php?filter=780&filter=4602

i think there is enough info here now for you to come to a very real decision.

in fact i am now thinking of getting an rv and providing it with high efficent lights and solar panels and wind geny

go here, read articles, follow adverts etc.

www.ledsmagazine.com

Here's one possible solution. Color temperature of 3000K, 75 lumens per watt.

http://www.elektor.com/news/high-efficiency-led-operates-off-ac-grid-voltage.1066093.lynkx?utm_source=UK&utm_medium=email&utm_campaign=news

Elector is the source of this information. The product is designed for 110vac, but you may find other solutions here. The manufacturer's link is shorter. If you used an inverter, the power drain would be extremely small compared to incandescent.

http://www.acriche.com

Actually, I think 'natural' is a misnomer. Since incandescent lamps put out very little blue light, and we have been using them for our entire lifetimes, we have gotten so accustomed to the yellowish light they produce, that anything else doesn't seem 'right'.

If you take a photograph, using only incandescent light, and later take the same photograph using natural light (sunlight, either clear sky or cloudy), you'll see that incandescent is hardly 'natural'.

I haven't yet taken any photographs or otherwise verified the spectrum to verify my belief, but I suspect that when I do, I'll find that the LED floodlights I have are much closer to 'natural' than any ordinary incandescent. It is dark here right now, and I just went outside to look at some plants illuminated by an LED Floodlight. The plants looked quite 'natural'. The light certainly contains more blue than that from incandescent floodlamps. I consider that a strength, not a weakness!

The one I tried was a 120V LED floodlight, not a 12V one, but the 12 V should be more efficient, since it is much closer to the voltage actually required by LEDs.

OcenaLED LIETS ... excellent light.. many diiferent kelvin temps to choose from..2600 - 10000

www.oceanled.com

try hid system the following link is very long, and takes you to chinese suppliers.

hid systems are i think about 94% efficent.

there are led systems lower down the page

http://www.globalsources.com/gsol/GeneralManager?page=prodalert/PAWeeklyInquiry&catalog_id=2000000003844&PAInqTyp=InqMore&GSPApos=learning2drive_W_InqMore_20100127&cp1=N|1026255175&cp2=N|1026274064&cp3=N|1026253759&cp4=N|1026328649&cp5=Y|1026282214|1026209652|1026193762&cp6=N|1026245708&cp7=N|1026245457&cp8=Y|1026185506|1026200241|1026282313&cp9=Y|1026228427|1026210320|1026209722&cp10=N|1026176801&cp11=Y|1026194869|1026194873|1026244503&cp12=N|1026185616&cp13=Y|1026209654|1026188057|1026156741&cp14=Y|1026187089|1026278077|1026187087&cp15=N|1026282357

Hi

bright white LEDs are available in the range of 6000K light blue tint. and called as cooldaylight LEDs. it is available also as warm daylight. they are close to incandiscent light. this led is preferred mostly by west. These products are available from PHILIPS and other Korean manufacturers.

Thanks every one for all the great links, ideas and answers! This forum rocks! I will post my progress soon. Cheers.

CrazyLEDs do a range of automotive LEDs

We have a member on CR4 named Campbell lighting. He has done some LED work, and might be able to help you. Good luck.

Hi Slowpokee

Check this link, http://www.cjservices.co.za/

I made show stands for their led lights a few years back, Their products looked good and met all the international road safety agency specs, they even do the car-top lights for police and emergency services units. I know they export all over the world.

N.B. Whatever you use, make sure they comply with your state road legal requirements or ALL your insurance will be void in the event of any accident.

Hi. I'm in the same position as you. I bought lights from eternaleds

I recommend the light strips for under cabinet FLEXSTRIP-WW Eternaleds FlexStrip LED Ribbon 1 foot- Warm White and for spot lighting the MR 16 works great! CHROMIA-6-WW MR16 LED Flood Light 6W - Eternaleds Chromia-6 -- Warm White These are both 12V, and warm white matches closely incandescent lighting. Here are pics of the strip (in my lab) and the bulb installed in my RV. flickr

cheers Rodger

Those pictures look like the real deal! I'll give them a shot! Thanks for the link!

While the majority of LED's are formulated to give a reasonable approximation to sunlight, hence more blue than incandescents, the eye is most sensitive to yellow, while further red works better to preserve the eye's night vision.

In addition, the yellow end of the spectrum (red even better) suffers less loss when reflected back through fog.

The yellow of fog lights is deliberate as it suffers minimal loss from fog, while still being within the area where the eye is most sensitive (which is why fog lights aren't red, the eye's sensitivity there is poor, but night vision preservation is good).

All of which is a long winded justification for you to find yellow LED's with enough blue/green to permit reasonable color rendition. (If you want to justify the blue/green part, just look at things in the almost pure yellow of low pressure sodium vapor lamps. Some colored items almost disappear).

actually the eye is most sensitive to green which is why night vision goggles are green.

the reason red is good for night vision is because the rods in the eye responsable for black and white vision which is used for night vision, Is not sensitive to red

I agree with #17 (also oscilloscopes are green for the same reason, or so I am led to believe...)

But #18 doesn't make sense! If the rods weren't sensitive to red, then you wouldn't see anything in a photographic darkroom with its red-only lights.

My initial goal was to provide a light source with similar properties of an incandescent bulb using LED technology. I started using the histogram on my digital SLR camera to plot and compare the light sources.

I think there are two challenges. One is to match the color spectrum and two is to diffuse the light. I tried to use a combination of red, green and blue LED's with different PWM frequencies. Since the brain can sample < 30Hz, it tried to pulse at a faster rate. I still noticed the flickering affect. I also think this is giving my SLR's histogram false readings! "I wonder how much a true photo spectrum analyser goes for these days?"

That's where diffusion might be key.

Any suggestions on different mediums? Plastics, gels, liquids,.

Refraction?

the eyes periphal part can detect 50hz flicker of lights so i would go higher

also re my comment on 18 re light sorry your right it doesnt make sense

red light will not affect your night vision,

night vision as i understand it uses the rods in the eye which only see in black and white and are most sensative to movement

http://www.flashlightreviews.com/qa/nightvision.htm describes it better

http://www.equipped.org/nitevision.htm below taken from link

A red light has been the traditional choice for retaining your night vision since before WWII when the military settled on red as the best choice. Recently, there has been a move to green and blue-green light, precipitated in large part by the military's change to green, which itself has been primarily motivated by the increased use of night vision equipment. As it turns out, green light also offers some advantages over red as a means to retain night vision capability. However, it isn't cut and dried.

Total brightness, or illumination level, of the light has a potentially more significant effect on night vision retention than does the choice of red or green. Because your eyes are more receptive to green light, we gain better visual acuity at lower light levels than when using red light. Green also allows for differentiation between colors that red does not and the magenta used on aviation charts, for example, is readily readable under green light, not always the case with red.

Both reasons contribute to the fact that pilots and many others generally seem to prefer green over red, it simply makes it easier to see and read in the dark cockpit. The potential problem is with the actual illumination levels we use, not the color of the light. The brighter the light, the more negative impact on night vision, both in our capacity to see and in how long it takes to gain back optimum night vision. This is true regardless of whether it is red or green.

CR4 Admin: Modified Post

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try this link sorry its so long, its from a chinese supplier,

http://www.globalsources.com/gsol/GeneralManager?page=prodalert/PAWeeklyInquiry&catalog_id=2000000003844&PAInqTyp=InqMore&GSPApos=learning2drive_W_ShowIMG_20100120&amp;cp1=Y|1026139579&cp2=Y|1026106705|1026147362|1025917946&cp3=N|1026075804&amp;cp4=Y|1026080553|1026094182|1026105888&amp;cp5=Y|1026055538|1026077948|1026055554&amp;cp6=Y|1026094910|1026049443|1026049437&amp;cp7=Y|1026080097|1026073706|1026073357&amp;cp8=Y|1026148481|1026139076|1026093707&amp;cp9=N|1025763578|1025763575|1026097349&amp;cp10=Y|1026139066|1026085255|1026147616&amp;cp11=Y|1026142223