Re: [APD] re minimum light threshold

["Rachel Sandage" <rachelsor at hotmail_com>]

My point was that the anubias tank has *no* other lighting, and that 15w is just not enough light for a plant to grow, regardless of how close it is to the light (in this case, about 3" or less away).
  ----- Original Message ----- 
  From: S. Hieber<mailto:shieber at yahoo_com> 
  To: aquatic plants digest<mailto:aquatic-plants at actwin_com> 
  Sent: Monday, October 04, 2004 3:54 AM
  Subject: Re: [APD] re minimum light threshold


  Is this with a white plastic reflector? If so, we might
  expect weaker effective lighting than 1.5w under a very
  efficient reflector. Borrowing form examples that are close
  at hand, I have found that in a 20 gal with 36w of light,
  Anubias do just fine even if substantially shaded by other
  plants. Same for a 15gal with 26w.

  Both of these are somewhat higher wpg than your case. And
  these are set-ups with the highly efficient AHS reflectors.

  In a tad smaller aquarium, with only a white plastic
  reflector, my 12 gallon under 26w behaves like a very
  highly lighted aquarium.

  I wonder if the 7 watt bulbs might have the preponderance
  of their output in the green range -- along with lots of
  infra red, of course.

  I also wonder is as much variation in wpg and the apparent
  plant effects might be found among larger aquaria.

  Could the small tank anomaly to the wpg rule of thumb
  merely be an example of the softness of the rule in
  general?

  For me, whether 7w is a lot of light kind of begs the
  question that I have in mind. It can mean a lot of
  illumination in a small volume or for a small nearby
  surface. 

  If I put a plant in the 3/4g tank, 8" below the the bulb
  and put another plant just like it in a 15g tank that same
  distance from the water surface and the same distance from
  a 7 watt bulb, then is the plant going to behave as if it
  has more light in the 15g? The plant doesn't know what size
  the aquarium is, does it? If not, then the size must be
  affecting the lighting.

  Scott H.
  --- Rachel Sandage <rachelsor at hotmail_com<mailto:rachelsor at hotmail_com>> wrote:

  > I read this thread with interest, because it seemed to me
  > that common sense had completely gone out the window
  > until someone pointed out that "7 watts is not a lot of
  > light", which seemed to sum it up for me.  I can also say
  > that even anubias will not grow in a 10 gallon tank with
  > 15W of light, if that is the only light the tank receives
  > - as is the case in my fry grow-out tank, which is in a
  > photographic darkroom.
  > 
  > rs
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