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originally posted by: MaximRecoil
originally posted by: charlyv
a reply to: MaximRecoil
All I can say is try it yourself. This is ATS, you can do it..
The LED lamps you're talking about: how many lumens per watt?
originally posted by: charlyv
They are about 30 lumens driven at 25ma. I slightly overdrive them, but the batteries will give out long before the LED fails.
High power 5mm LEDS can go 30-90 lm/W, but you are not going to get any where near the high end here due to the type of LED and the power.
originally posted by: Phage
a reply to: MaximRecoil
Why do you say 9,000 feet?
ETA: There were, as you can see from the METAR posted above, a few clouds as low as 3600 feet occasionally, so that might bring the unknowns as low as that.
Does anyone know what type of clouds are seen in the video? Different types of clouds appear at different altitude ranges.
If they are 30 lumens, that's 240 lumens per watt, which is well beyond the high end of 90 lumens per watt that you said you couldn't get anywhere near in this application.
originally posted by: Phage
Thin clouds.
The METAR also indicates that the ambient surface temperature was quite close to the dew point, indicating that low clouds could form quite easily. Someone mentioned the possibility of industrial "steam."
In other words, no. No way to determine the actual altitude of the clouds.
I know. But the lights could be seen through them?
"Thin clouds" isn't a specific cloud type.
That would depend on the horizontal distance, wouldn't it? You are making three assumptions; horizontal distance, elevation, and height.
As an example, a 45-degree angle line drawn down to the ground from an object at an altitude of 3,600 feet, would be ~5,091 feet.
originally posted by: Phage
a reply to: MaximRecoil
I know. But the lights could be seen through them?
"Thin clouds" isn't a specific cloud type.
That would depend on the horizontal distance, wouldn't it? You are making three assumptions; horizontal distance, elevation, and height.
There is insufficient information to reach any conclusion about the actual distance of the lights.
There's enough information to make a good estimate of the minimum distance
originally posted by: Phage
a reply to: MaximRecoil
There's enough information to make a good estimate of the minimum distance
No there isn't.
No, not a guess; an estimate. The lights are above the clouds. According to the weather data, minimum cloud height was 3,600 ft.
You are guessing at the elevation.
False. See above.
You are guessing at the cloud height
Do you think cloud height is going to change drastically in that distance? What good is weather data if it's only relevant for the exact location in which it was measured?
(the airport is 10 miles away).
You are guessing at how bright an LED must be.
You are convinced that there is something very extraordinary there.
Define drastically. Five hundred feet, a thousand feet? Yes, absolutely possible.
What of it? Do you think cloud height is going to change drastically in that distance?
As was my previous post in regard to yours.
All of my posts have been with regard to the dubious nature of your guesses.
originally posted by: Phage
Define drastically. Five hundred feet, a thousand feet? Yes, absolutely possible.
As was my previous post in regard to yours.