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6500k Lamp

Discussion in 'Plasma TVs' started by tbrar, Sep 22, 2003.

  1. tbrar

    tbrar
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    Has there been any update on the availability of an 'Ideal Lume' UK version of a 6500K lamp, or indeed any other simalar sources

    The topic was posted a while ago, but dont think it had reached any sort of conclusion, though I think waiting for the Ideal Lume version was recommended.

    Any suggestions ?? :confused: ..
     
  2. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    The Lume guys are not keen on getting CIE approval. So we may have to try and build one ourselves.

    Gordon
     
  3. Timmy B

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    Can we not just use a transformer?
     
  4. EvilMudge

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    Does that mean that the D in D65 stands for Decepticon?:clown:

    Yes, but then it won't be CE approved, and in the event of a fire, even if not started by the lamp, your insurance wont pay out.
     
  5. Timmy B

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    If you build it, they will come.
     
  6. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    It seems the take up in the dometic world in US has been really low. They sell them to telecine facilities a plenty but that's not enough to warrant trying to do a UK one.

    I'll speak with some folk and see if we can come up with something. It's not just a D65 lamp we want one with the right spectral characteristics, I believe

    Gordon
     
  7. EvilMudge

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    Not entirely sure of the ground I stand on, but it was my impression that the 65 in the D65 indicates a colour temperature of 6500 Kelvin, and the D indicates the particular spectral characterisitcs (in this case I think it's fairly close to the natural/black-body spectrum). Therefore any D65 lamp has the right spectra. I know it's possible to buy other lamps which have different spectra at the same colour temperature point though.
     
  8. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    The D is for the co-ordinates on the CIE chart. It happens to be 6504K. It is possible to get many devices to track close to or on D65. I do not believe that means they all have the same spectral character. If I get the chance I'll confirm this by showing you spectral chart of a DLP and a plasma both a D65. Should be interesting whether I am right or not.

    You are correct that spectra may not be the same at the same temperature.

    Gordon
     
  9. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    OK brain is hurting. I'm actually a bit knackered and in cloud cuckoo land. Mudgy you are probably correct now I consider this with a beer in my hand....mmm..beer.

    Answers soon...on a postcard..

    G
     
  10. tbrar

    tbrar
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    So can I buy one or not :D :confused:
     
  11. Gordon @ Convergent AV

    Gordon @ Convergent AV
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  12. NicolasB

    NicolasB
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    Buy a light box designed to treat SAD, with daylight-spectrum bulbs....
     
  13. avanzato

    avanzato
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    The last time this came up someone was going to try and get a Gretag Macbeth colour matching tube. Haven't heard anything since so did it happen?

    Would my front projector benefit from a bias light?
     
  14. EvilMudge

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    I've got one, and it sits behind my centre.:D Actually it's a SAD alarm clock, and it has a positive effect on subjective contrast, but it's nowhere near being a correct D65 lamp.
     
  15. RobsterD

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    Joe was looking into alternatives to the Ideal lume,not sure how he's getting on,maybe Joe you could post an update,there seems to be a reasonable amount of interest,I've been after one for ages with no joy.
    Rob
     
  16. NicolasB

    NicolasB
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    Not the same thing at all.

    I meant one of the "Zeus" boxes from here.

    Granted it probably still isn't 6500K. :)

    But even the standard bulbs produce a very nice, bright, white light that is much more energising and pleasing to the eye than what you'd get from a tungsten filament (even a halogen bulb). They also do "special daylight spectrum tubes" which, one assumes, mimic sunlight fairly accurately....
     
  17. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    The daylight spectrum is the sort of thing we probably need. I'm going to call Osram tomorrow and chat with their technical guys.

    Gordon
     
  18. EvilMudge

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    I've got several filtered fluorescent tubes for standard fittings - these are specially designed to provide a daylight like spectrum, but they are incredibly bright. If you put one near a Plasma or LCD display you would need to shield the screen somehow, they would almost certainly 'wash it out'.
     
  19. NicolasB

    NicolasB
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    Put it farther away...? :)

    Incidentally, the Innovations catalogue used to sell tungsten filament light-bulbs that were supposed to produce daylight spectrum. The glass of the bulb was blue, owing to doping with some rare-earth element (I don't think they said which). I don't know if one can still buy these.
     
  20. MAW

    MAW
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    Innovations are down the tubes. In any case, with themit was probably a Sainsbury's pearl 100w with some blue nail varnish...
     
  21. gmt steve

    gmt steve
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    That might have been me, but in their reply they stated that they are only sold in boxes of 10, so I didn't bother.
    No you don't need a bias light with a front projector since the display takes up such a large part of your field of view. The reason for a bias light is that a regular displays will take up a small part of your field of view, but will be very bright. That means that in a unlit room, your pupils will dilate since almost all your field of view is dark, but right in the centre is this small bright area. This conflict is very wearing on the eyes and causes fatigue. A bias light behind the display will increase the lit area that your eyes are looking at, without causing any distracting reflections on the screen. The need for a D65 bias light is so that the light itself is neutral and will not alter your perception of the colours in the display. It assumes that your walls, ceiling and carpet are all D65 in colour too. They are aren't they?:D
     

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