Plant light?

Go To Last Post
11 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I'm planning to make a plant light. Searched for clorophyll info. Found it's light absorption graphic : http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=stryer&part=A2670&rendertype=figure&id=A2672

I have thought of something like: 4x fluorescent light tube + 50x 4500mcd red led + 50x 4500mcd blue led

The idea was that light tubes would generally illuminate the plant, and leds could be switched optionally. (Have read that red light is better for roots and flowers, blue - for leaves and energy production)

So now I'm looking for a light tubes which would fit the requirements (so that tube's light emission spectre is as close as possible to chlorophyll light absorption graphic). Not too expensive )

I'd appreciate any advice on this problem. Maybe someone is using any plant lights and would share the experience?

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Ask your local cannabis grower.

You should be able to by everything you need from the cannabis supply shops. I think they just use fluorescent tubes, but with special phosphors for hydroponics.

Google is your friend. Different plants probably have different requirements. Horticultural textbooks should help with this. After all commercial nurseries have been extending both food and flower growing seasons for years.

David.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

LOL...

I think the point of the OP asking here is he probably lives in a country where there is no "High Times" boutique on the corner... ;)

The boys are telling me people use high-intensity discharge metal halide lamps for the green phase, and high-intensity discharge sodium vapour lamps for the flowering phase. But I wouldn't know.

Fluorescent tube might work but you would need a lot of them to get even lumen-wise.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

As far as I know, the boutiques do mail order, and they supply all the information required.

thunderbolt87 can buy whatever equipment he likes. Or read any textbooks, growing advice etc.

He wants to grow flowers anyway, so there is nothing illegal in that. Even in England where they like to ban everything possible, preferably if it is stupid.

David.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Try Googling 'Grolux'. These lamps have been around for a long time and are used for plant growth and aquariums etc.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Grolux, yes. It's a bluish-pink light rich in long wave UV and very energy efficient compared to halide lamps. They may not look all that bright to the eye, but plants seem to think they're adequate. Halides also get dangerously hot in a confined space.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Forget Grolux fluorescent tubes for the specified plant, the light spectrum it emits is mostly unuseful to it. These are fine to provide some survival light to interior plants, but aren't intended as replacement for the Sun. Halides are THE most energy efficient for the light output for growing plants. They output more visible light and less heat per watt than fluorescent or incandescent lamps. Yes they heat up, and you have to deal with it, but in a well ventilated grow area this should be no problem. If you need to go fluorescent, you should stock in on "daylight deluxe" and "cool white" tubes. Again forget energy savers, the way these are made is by changing the spectrum of light emitted to be more visible white light, and they do not provide the lower red or higher blue portions of the spectrum the plant needs. Be prepared to dish out at least 1.5x the amount of energy using fluorescents for the same lumen output as a Halide though. Meaning that to replace a 400W Halide you will need about 600W of fluorescents.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

My plan is to make something like an incubator to keep plants inside for a while if they look sick (in winter), or before planting outside, so that they are strong enough to survive, maybe - for growing some rare plants which require special conditions.

People say that cool white tubes must be changed to warm white tubes when plant is goung to bloom. I thought that I would install 4 (?) full spectrum light tubes and additional leds to add more blue or red to the ordinary lighting.

So maybe anyone knows which full spectrum fluorescent t5 24'' tube is better? (under 15$ per tube)

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

For your application, fluorescent tubes seems the way to go. If it is just for survival over the winter, a mix of half "Daylight Deluxe" and half "Cool White" tubes should be fine through all cycles. If you are setting up with the intention to "power-grow" you will not get far with fluorescents though.

I don't think the LEDs will have any noticable effect in the long run, but I have never tried it. Considering 48" fluorescent tubes cost about 3$-4$ each over here, there is no reason to go the more expensive route with high brightness LED's. And if you had in mind of using just regular LED's, forget about it, the output intensity just isn't enough to work against the fluorescents.

And "Warm White" and "Cool White" are roughly the same, you can swap one with the other without a problem. Color temperature for Warm White is around 3000K, for Cool White around 4100K, and for Daylight Deluxe it is much deeper into the red spectrum, at 6500K.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Some years ago, a lady who owned a greenhouse told me:

"Use 1 'natural light' florescent tube and 3 regular tubes in a 4 tube light fixture."

I didn't get to plant my indoor garden.

If you don't know my whole story, keep your mouth shut.

If you know my whole story, you're an accomplice. Keep your mouth shut. 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

About LEDs. I'm thinking of something like: http://cgi.ebay.com/100-PCS-5MM-Flat-Top-Blue-LED-Wide-Angle-light-12000mcd_W0QQitemZ290384941172QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item439c4a9074

well, maybe 200x red + 200x blue. it depends on how bright they really would be, and how big my chest would be. If they really are 12.000mcd each i think i could even wake my neighbours across the street, by this thing. Also should make some precautions so that my incubator would shut all lights down when opened.