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  1. R

    bulb/lamp for planetarium

    Yes a hemispherical pattern would work? It should be as small as possible because you can see the reflection of the glass if it is too big. The sphere is about 6" in diameter and the ceiling height should be about 8' and the length and width of the room will be a little more than 9'. It...
  2. R

    bulb/lamp for planetarium

    I can't use the Luxeon because it is directional. I need equal amounts of light in all directions. The halogen bulbs are too big (well the filaments are). The problem is the filament size because it projects onto the wall and you can see it, which makes for pretty poor non-circular stars.
  3. R

    bulb/lamp for planetarium

    Hi everyone, I am trying to find a bulb that is very bright, has an extremely small filament, and decent life (>100 hrs). I'd like soemthing like the minimag bulb, but it needs to last a lot longer than those. Does anyone have any ideas? The size of the bulb doesn't matter, but the size of...
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