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Hoppy Hoppy is online now

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Showing Visitor Messages 1 to 10 of 165
  1. Hoppy
    03-31-2014 01:12 AM
    Hoppy
    I haven't shipped any PAR meters to Canada, but I suppose I could figure out how to handle that. It does require that I visit the Post Office each time I do that, and pay whatever they decide to charge me, plus filling out lots of paperwork.
  2. Hoppy
    03-31-2014 01:11 AM
    Hoppy
    I'm not making any PAR meters now, instead I am trying a new technique for making the sensors, see http://www.plantedtank.net/forums/sh...=453225&page=3 If that works out I will probably resume making them. You can use a Lux meter, as long as you keep it out of the water. Just divide the lux by 78 to get a fairly good estimate of PAR.
  3. hitmanx
    03-31-2014 12:59 AM
    hitmanx
    So are you still selling your meters? What's the cost? And do you ship to canada? Are there similar alternative? Lux meters maybe?
  4. Hoppy
    03-30-2014 02:55 AM
    Hoppy
    hitmanx, you can just prop the light across a couple of chairs and measure the PAR out in the air, at the same distance that they would be from the substrate. That reading will be very close to what it is in the tank, in water. If anything it is a big lower than what you get in the water.
  5. Hoppy
    03-30-2014 02:54 AM
    Hoppy
    My PAR meter sensors are all waterproof, to the extent that a quick trip into the water shouldn't harm them, but they can't be left in the water for more than a few seconds without some risk of leaks.
  6. hitmanx
    03-29-2014 04:17 PM
    hitmanx
    Both the 8.5in and 10.5in domes completely surround the Philips 23w 6500k cfl I am using so all available light is being reflected down. Are your par meters water proof? Could place them directly into my existing tank? I guess this is the only way I will actually know what kind of light levels I am dealing with
  7. Hoppy
    03-29-2014 03:52 PM
    Hoppy
    Yes, I did some testing with at 10.5 inch dome reflector. But, I have not compared the light output from the two sizes of reflectors. It isn't an easy thing to figure out, because the smaller dome doesn't completely surround the larger wattage CFL bulbs, making it capture less of the stray light. Intuitively, the 8.5 inch dome should give a higher PAR than the 10.5 inch one, for small CFL bulbs which don't extend out of the dome profile. But, when a bulb does extend out of the dome profile there is a big loss of light.
  8. hitmanx
    03-28-2014 11:58 PM
    hitmanx
    Okay that makes sense. So wont the larger dome spread the par even thinner then? So at the same height and same bulb the 10.5 would give less light per unit area than the 8.5?

    Did you conduct the tests that led to your vertical cfl chart for a 10.5inch dome? According to that I would have a par of 90...
  9. Hoppy
    03-28-2014 10:29 PM
    Hoppy
    The higher you raise the light the larger the circle of light gets, so the lower the light per unit area gets. PAR is light per unit area. If you want to be sure to have low enough light, just raise it 2 inches instead of one inch. Then, if you still have difficulties with BBA you can either dose Excel at 2X the recommended dosage - or 2 ml per 10 gallons every day - or you can raise it another 2 inches. Without a PAR meter you can only do this by trial and error.
  10. hitmanx
    03-28-2014 07:52 PM
    hitmanx
    After 4weeks small tufts of BBA are starting to show up on dying leaves at the bottom of tank, dwarf sag, and on the anubias petite. I removed as much as I could and raise raise the light 1 inch.

    Now my question is will a 10.5 inch fixture just extend the lighting footprint outwards or does it alter the available par values enough to warrant raising the light? The 8.5in is giving a spotlight effect with plants growing up and inwards.

    Thanks

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    Hoppy

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