Timeline for Dramatic orbital spotlight feasibility and price
Current License: CC BY-SA 4.0
13 events
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| Feb 17, 2021 at 17:10 | comment | added | MolbOrg | @TamiusHan good points, on which the answer can be greatly improved. They dive into 3 subjects - linguistics or whom op wish to impress, physics as Absorption spectrums of things op will be surrounded, and biological adaptation perception of creatures op wish to impress. I assumed that creatures will be humans, so as linguistics of white op states the ability to change color is a desirable thing so as he ready to prepare or select a place to accommodate things - so we are quite flexible in all the directions, I guess. But all your points are valid, nice to see such an informed comment. | |
| Feb 17, 2021 at 14:30 | comment | added | Tamius Han | @MolbOrg You could make an argument that a white light with a color rendering index in single digits doesn't count as white. If I shine my three-wavelength-white light at an object that appears white in sunlight and the object suddenly appears red (and yes, you can have a "white" object appear red under "white" light if neither of the whites covers the entire spectrum) ... I'd say you could argue that neither light nor the object are white. If you want a light source that looks white and behaves as white light, you need to cover the whole spectrum. | |
| Feb 17, 2021 at 13:40 | comment | added | Nuclear Hoagie | If the laser is still dangerously powerful when it hits he ground, just turn it down some. There will certainly be a sweet spot between being powerful enough to injure and being too dim to see. You just need a laser that's tuned to shine through X km of atmosphere, and no more - it can't be both so powerful that it burns skin and also so dim that you can't reduce the power. | |
| Feb 16, 2021 at 21:17 | comment | added | Alexander | @L.Dutch - Reinstate Monica my objection was to "laser burns". Our desired level of Illuminance may get the target a little warm, but nowhere near the level of burning. | |
| Feb 16, 2021 at 20:50 | comment | added | MolbOrg | "To make it appear white as perceived by the human eye, you would need to cover the whole visible spectrum" - surprised anyone using computer devices is capable to write such thing, while rigth at the moment u reading that comment u are looking at RGB screen which physically incapable to cover whole spectrum, nor it has to as human eyes are incapable to percieve it, as they have mostly 3 ligth detecting rhodopsines for red green blue, it is not impossible to have more thre are animals with 12, but we work on 3. And all colors we distinguish are combinations of intensities of those. | |
| Feb 16, 2021 at 20:46 | history | edited | L.Dutch♦ | CC BY-SA 4.0 |
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| Feb 16, 2021 at 20:05 | history | edited | L.Dutch♦ | CC BY-SA 4.0 |
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| Feb 16, 2021 at 19:57 | comment | added | L.Dutch♦ | @Alexander, spotlights used in theaters are hot enough to keep the performer warm if not sweaty. And they are not hundred kilometers above their head. | |
| Feb 16, 2021 at 19:43 | history | edited | L.Dutch♦ | CC BY-SA 4.0 |
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| Feb 16, 2021 at 19:41 | comment | added | L.Dutch♦ | @TheSquare-CubeLaw, even a monochromatic led is still way more broad than a laser. | |
| Feb 16, 2021 at 19:00 | comment | added | Alexander | "Powerful" is a relative term. According to OP, the laser should be just powerful enough to create the desired "spotlight" effect. Something like 100 watts spread over 1 square meter won't even burn human eyes. | |
| Feb 16, 2021 at 18:52 | comment | added | The Square-Cube Law | The color problem could be solved by using three lasers instead one, no? | |
| Feb 16, 2021 at 18:40 | history | answered | L.Dutch♦ | CC BY-SA 4.0 |