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This is a discussion on Confusion about Light Intensity with 125W CPF within the Semi Hydro / Lights / Greenhouses / Accessories forums, part of the Orchid Culture category; The readings with a digital light meter correspond to the cheaper meter I've been using ...
The readings with a digital light meter correspond to the cheaper meter I've been using
At the suface of the bulb 9600-10000 ft candles
6" distance 2300 ftcandles
These readings where done at night, but the orchidarium does sit close to a large east facing window. However the window faces another building ~20 ft away, so there very little direct sunlight. I've thought about moving the orchidarium to a south and east facing corner window but I think 4hrs of direct sunlight will just destroy my orchids. Before the orchidarium was built I housed a few phals in a terrarium w/o any supplemental lighting, and was placed at the same spot that the orchidarium now sits. These phals are all in spike or flowering, so I think whatever ambient light enters in through this east facing window is sufficient for the phals. I guess I'll just be patient and see what my babies say.
Thanks all for the suggestions and tips, I'll post another thread about the building of my current orchidarium when I have more time.
Sorry I can't PM jrod, I'm a newbie
Nothing but love
I will say aaaah to the 6 inch top portion has too much light! Maybe grow vandas up there I guess, but I don't have experience with those. And Dendrobriums (phal type).
You can grow phal in the 3 ft region I think if you have the lights on for 14-16hrs, but the top potion wouldn't need that many hours so its hard. Paph Maudiae are also low light plants.
Just set up a low wattage light for the bottom half....it will be much easier.
At 9:30am, the ambient light adds another 150 ftcandles 6" from the window, 100ft candles at 12" and 75ft candles at 24"
The bulb is ~16" long, and I haven't recorded any difference in light intensity at the side of the tank. I've been thinking about ringing the top 6" of the tank with thin aluminum or copper, so I could glue some mylar to the metal and then attach that to the outside of the tank.
Again, thanks for all the replies, this a great site, I'm glad to come across it
Nothing but love
Sounds like a light diffusion issue. You could try swapping out your reflector, to get more light on the bottom of the tank, rather than losing a lot of it into the surrounding room. Otherwise, you might be stuck. Good luck.