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Hoppy Hoppy is online now

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Showing Visitor Messages 21 to 30 of 172
  1. hitmanx
    02-28-2014 12:12 PM
    hitmanx
    Sorry, I don't mean to to be a pest, but I'm trying figure out how high to hang the light to achieve upper low light par. At what height do you think it would be 40par? Which one of your charts did you use to get get to that answer? Can I assume the lower numbers chart you made and the one i4x4nMore or more realistic? I just need a ball park so I have somewhere to start from and tweak... are still selling par meters?
  2. Hoppy
    02-28-2014 03:51 AM
    Hoppy
    I think you will get around 40-45 PAR, which is low medium light.
  3. hitmanx
    02-28-2014 01:39 AM
    hitmanx
    thanks for the reply. in my case i want low light, and my tank dimensions are 13x13in surface area, so i currently have a 23w daylight in a 8.5in dome and the bulb does NOT stick out... in the mean time, based on your previous experiments, which chart should i be using?

    thanks again
  4. Hoppy
    02-27-2014 12:48 AM
    Hoppy
    When there was big disagreement about how much PAR one of those bulbs would give, there were 3-4 of us making measurements, and making various errors in doing so. Plus, we found that a bigger CFL bulb that would stick out of the dome reflector would give significantly less PAR, and we were mostly using 8.5 inch domes, not 10 inch ones. With the 10 inch dome the bulb doesn't stick out, as I recall, but with the 8.5 inch one it does. I haven't revisited that subject since then, but I have planned to do so sometime.
  5. hitmanx
    02-26-2014 11:30 PM
    hitmanx
    Referencing this post: http://www.plantedtank.net/forums/sh...=1#post5391970

    Maybe you can shed some light (pun intended) on my problem with fluorescent bulbs and dome reflectors.

    Data from several sources seem to contradict each other, maybe I'm just not reading it right.

    Thanks
  6. Hoppy
    02-17-2014 03:39 PM
    Hoppy
    You would be providing a very limited lighting spectrum if you use just the actinic bulbs. Plants do use that light, but they need more than that, as far as spectrum is concerned. And, most people find a planted tank with just actinic lights looks very weird, spooky, and lacking in colors.
  7. Designmejen
    02-17-2014 12:09 AM
    Designmejen
    Thanks for the info. Do you think it'll be ok if I just run the 2-420/460 actinic lights?
  8. Hoppy
    02-16-2014 03:21 PM
    Hoppy
    Any 4 bulb T5HO light is likely to be too much light for a 20 gallon tank. But, the Aquaticlife lights also have good reflectors, so with all 4 bulbs on you should have about 150 PAR at the substrate. There is no way to get enough CO2 in the water to fill the plant's needs to grow at the rate that much light demands. That is certain to lead to big algae problems. Even with 2 bulbs you will have to be very careful to get enough CO2, enough oxygen in the water, and good enough maintenance to be able to avoid algae problems.
  9. Designmejen
    02-16-2014 03:45 AM
    Designmejen
    Hi Hoppy. I have a Aquatic Life t5 HO 4 lamp lighting system on a 20gal high tank, and I wanted to know if you have any suggestions on timing my light system.
  10. Hoppy
    01-13-2014 12:13 AM
    Hoppy
    Casardo, I don't know how long T5HO bulbs remain effective. What I read suggests it is a year or longer.

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