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21
So how close will the 400kwh of leds be hanging to the trees?  Im sure it can be done but it seems like its going to look terrible.

Light positioning hasn't been decided yet.  I'm rather fond of the idea of embedding them into the structural framework (they're long thin strip lights), but it'd require tight beam angles to avoid wasted light (I haven't measured the beam angles yet, but I suspect they're not tight enough). The lights in this dome alone would weigh over 10 tonnes.  If they do end up hanging, the heights and angles would be adjustable.  The brand we're looking at is totally silent - no fans, passively cooled.

Also, it's not "100%" LED, just overwhelmingly.  I'm actually working on the light design right now - the challenge is to max out lighting efficiency (aka, red LEDs) while still having a comfortable, natural "daylight" look to the light.  From some early tests, it looks like it's probably going to be 80-90% red-white (not red-blue) LED plus 10-20% HPS  to add more green-yellow-orange light to the spectrum (LEDs aren't very good at producing those colours) and improve the colour-rendering index. It doesn't take much - human eyes are really sensitive to that portion of the spectrum.   With the red-white LEDs, they'd shift more to the white spectrum during the day (but still having as much red as possible without looking unnatural), while mornings and evenings would shift to the red spectrum.
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So how close will the 400kwh of leds be hanging to the trees?  Im sure it can be done but it seems like its going to look terrible. 
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I'll take Amrapalli if you have her at the moment :-)
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You can go for inspiration to Germany.
"The enormous dome was originally built as an airship hangar for the German company CargoLifter AG. The steel barrel-bowl construction was made to measure for the production and operation of heavy lift airship, and is optimized for volume and aerodynamic form. Built by a subsidiary of Siemens, SIAT, the building's giant dimensions posed an architectural challenge. The roof's surface measures 70,000 m and is able to withstand the significant mass of rain and snow that falls on it. The heating system is able to maintain constant temperatures in the over 5 million m of air. The building was constructed using almost 14,000 tons of steel...
the air temperature is 25C and humidity a pleasant 40 - 60%, perfect conditions for plants from all over the world. There is also under-floor heating in the Lagoon and the Tropical Sea area, so visitors do not get cold feet.
The 7,000 m of water in the Tropical Sea (28C) and Lagoon (32C) are cleaned using the latest ozone filter technology. This makes the water quality equivalent to that of drinking water. The pools themselves are constructed of stainless steel for optimum hygiene. The water has a maximum depth of 1.35 metres."

What do they do for supplemental lighting during winter?  It seems like there wouldn't be sufficient lighting in DE in winter to keep tropicals happy.

https://www.nytimes.com/2005/02/03/world/europe/brand-journal-its-germany-dead-of-winter-and-its-95degrees-in.html

Quote
But there are problems, described by the enthusiastic staff as normal for a start-up. Among the most conspicuous is that the promised all-season sunshine turned out to be hard to deliver. The artificial lights do not come close to reproducing the tropical sun. And the ceiling of the immense, glass-roofed hangar is lined with a translucent sheeting, apparently designed at the time the place was a dirigible factory to keep the sun out. There are plans to remove the sheeting to let in more light. But in the meantime, nobody is wearing sunglasses, and the 40,000 tropical plants are not flourishing.

"They're suffering," said Stefan Berndt, a staff horticulturalist. In all, he said, about 150 species of plants were imported, mostly from Asia, some from South America, none of them accustomed to a Prussian winter. "It's a mega problem right now," he said, but once the light is allowed to come in everything should be fine. It will take a year or so for the plants to start growing, he said, but eventually it will look like a real, lush rain forest.

The dirty little secret with a lot of commercial "tropical horticultural gardens" is that they slowly kill their plants with insufficient light, and then just replace them whenever they no longer look nice.

I would have zero interest in taking part in a project like that.  Of course, we're lucky here that we have such abundant, cheap, clean electricity.  Lighting up that CargoLifter dome with the power density that we're doing here would cost a fortune in Germany, and have a pretty hefty CO2 footprint.
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No worries :-)  Any luck with Ambika or Amrapalli?
Yes with Amarpali,
I'll graft Ambika this season.
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That's it, you got it!
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Tropical Fruit Buy, Sell & Trade / Re: Low Chill Stone fruits
« Last post by starch on Today at 12:42:55 PM »
Anything around 100 chill hours?

Florida prince, Evas pride, may pride are all the super low chill early types.  My florida prince is already in bloom.

Same here. My floridaprince is in bloom. Always blooms in Jan. Prolific producer of very good early peaches.
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Tropical Fruit Buy, Sell & Trade / Re: AeAe for sale
« Last post by RiversOFT on Today at 12:28:03 PM »
Message sent!
29
Tropical Fruit Buy, Sell & Trade / Re: AeAe for sale
« Last post by Luisport on Today at 12:24:15 PM »
PM sent...
30
Temperate Fruit Discussion / Re: Tree planted too shallowly (?)
« Last post by Triloba Tracker on Today at 12:22:17 PM »
Right on. Yeah IME it can sometimes be hard to tell the soil level.
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