That is one hell of a serious answer there, cee. You are helping me get to the meat of what I'm trying to formulate in my head. I only have a very rudimentary light meter, and any/all sunlight pegs it high. I've also been wondering how greenhouse conditions would affect this plant, presuming it absolutely requires a barest minimum of five hours direct sunlight. Wouldn't it mimic shade? If so, how deep the shade (again, presuming this is a standard type of greenhouse of the type where other flowering plants can be grown)?

Look in my gallery, you'll see the current growing conditions. Been out there since seedling stage, but my husband just built me a rolling shelf unit that effectively doubles my usable floor space. Been utilizing LST as well. I also started a thread on the sexing process, did this after separating plants based on physical expression (phenotype?) in terms of growth habit and leaf structure. This will allow for some serious culling.


If I could easily take my own measurements, I've surely got the time. I just don't have the equipment (unless the camera has features I could use, Canon Rebel series DSLR). I do have fun turning the lens backwards for super macro close-ups.

Thanks for this, cee, this is very rep-worthy stuff.

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I've Gotta A Pretty Simple Question.

Is There A Maximum Level Or PEAK Of Light A Single Plant Can Photosynthesize Or Use?

Yes, but with any light source that we use, you will cook the plant with IR and UV before you can reach that point.

The way to determine that experimentally would be to monitor growth as a function of monochromatic light, such as those produced by lasers or LEDs. Then you are not increasing the intensity of other energies of radiation with those that are relevant for photosynthesis.

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Lumens, lux, and adding it all up :: 16K HPS vs. CFL :: DIY Drip Irrigation :: Pack water transport

Like, If You Had Four 1000 W Sonagro HPS Bulb Over A Single Plant???......

that's not a good experiment. you'd cook the plant.

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Lumens, lux, and adding it all up :: 16K HPS vs. CFL :: DIY Drip Irrigation :: Pack water transport

I'm checking out your gallery right now.

A good first step would be to grab one of these or something like it: Amazon.com: Mastech Professional Luxmeter, LX1010B: Home Improvement

Then monitor intensity vs. hour of day, do the same for the grow space you were using, and construct a plot like the one in my previous post. That will get you a big jumpstart on figuring out wth is going on. You can even do the measurement shelf by shelf!

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Lumens, lux, and adding it all up :: 16K HPS vs. CFL :: DIY Drip Irrigation :: Pack water transport

And If The Lights Were Relatively Far From The Plant With GREAT Ventilation And Fans?

then you might as well use a smaller light.

all the radiation that is cooking the plant diminishes over distance the same way that the radiation that helps the plant is. get it?

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Lumens, lux, and adding it all up :: 16K HPS vs. CFL :: DIY Drip Irrigation :: Pack water transport

WELL THEN!! Lol, If It Was Possible To Do It Without Frying The Plant...

the understanding of lumens::

Plant growth involves the conversion of light energy into plant-building materials. Two factors are important for optimal growth. In the first place, the light intensity. Light intensity is expressed in 'lumens'. At least 50,000 lumens are needed for growing indoors. It's not sufficient to add up the number of lumens listed by the manufacturer for each lamp. The total number of lumens given off is depends strongly upon good reflection, and proper connecting fixtures and starter ballasts for the lamps. The quality of the reflector used, and the connecting fixtures and ballasts determine the light yield for the greatest extent. For those reasons, self-built sets and home-designed illumination often deliver a lot less light yield than lamps being used in professional horticulture. We can improve the light yield in our grow room by applying reflective material. We haven't painted the walls of the room matt white, and used reflector caps for the lamps for nothing! The second important factor is the wavelength of the light. For the production of chlorophyll, and an optimum photosynthetic reaction, light from the blue spectrum (445 nanometres), and light from the red spectrum (650 nanometres) is necessary. Blue light ensures optimal phototropism. Phototropism is the phenomenon which causes plants to grow towards the light, and to spread their leaves in such a way to receive the most light.

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Any involvement in illegal activities expressed and/or implied by my communications in this forum are lies and untrue