The Ever-Present Glow of LED Greenhouses

Re:The Ever-Present Glow of LED Greenhouses by foofoo55 on Tuesday October 22, 2019 @09:25PM (#21330196)

The yellow/orange lights could very well be high-pressure sodium (HPS) lighting, the same type used in street lights prior to LEDs. Like the street lights, LED lights seems to have less wash and reflection back into the night sky than HPS, and use less power than HPS for the same growth effect on the plant.

The industry is still transitioning to LED lighting due to cost and because some plants don't respond very well to LED light, so more development is required.

I remember when HPS became a big thing in greenhouses and people would call the fire department at night thinking the glow meant a nearby fire.

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Re:The Ever-Present Glow of LED Greenhouses by thrower123 on Tuesday October 22, 2019 @09:28PM (#21330213)

The best part of buying a house out of town was that I never have to look out my bedroom window at night and see that ever-present hellish orange haze from the street lights ever again.

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Re:The Ever-Present Glow of LED Greenhouses by nullc on Tuesday October 22, 2019 @11:30PM (#21330789)

A lot of commercial lighting is switching off of HPS because of claims about LED lifetime costs based on (seemingly false) figures about durability. (E.g. drive around Los Angeles and see the dead/dying LED streetlights all over the place).

I wouldn't be surprised if HPS lightning starts becoming unavailable as a result-- this has already happened with LPS lightning, with several manufacturers shutting down fabrication.

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Re:The Ever-Present Glow of LED Greenhouses by curben on Wednesday October 23, 2019 @01:32AM (#21331390)

> claims about LED lifetime costs based on (seemingly false) figures about durability. (E.g. drive around Los Angeles and see the dead/dying LED streetlights all over the place).

LED can be made durable if desired. In Detroit's case[1], the high failure rate can be attributed to manufacturer cutting corner on heat dissipation.

[1]: https://news.ycombinator.com/item?id=19848794

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Re:The Ever-Present Glow of LED Greenhouses by JohnJamesRambo on Tuesday October 22, 2019 @10:08PM (#21330395)

I think it is definitely possible. I don’t know of any led grow lights that make yellow tinged light, nor any reason they would want led lights with such a low color temperature. Double ended hps bulbs are still pretty efficient and I’m sure many greenhouses haven’t switched over. Gavita is a huge manufacturer and pioneer of lights like this and is based in the Netherlands.

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