The Planted Tank Forum - View Single Post - High Light vs Photoperiod vs distance (PAR)
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Old 11-02-2012, 09:31 PM   #8
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Hoppy, Thanks for responding

I just looked at the new charts and wow, there's a lot more to consider. My unit's not listed there and I'm not sure what the reflectors look like on those units.

I'm using an Aquaticlife 4x36" T5HO unit: It has worked reliably and their customer service is pretty good, btw.

You can see the PAR performance in their user manual (Page 4/5):

I've got 2 of the original Aquaticlife 6000K bulbs (8 months old) and 2 Zoo Med Ultra Sun Trichromatic Super Daylight Bulbs 6500K ( (7 months old)

The reflectors are 1/2 parabolic but each bulb has a reflector.

The unit is 9" across, the bulbs are evenly spaced and 8" apart.

I'm starting to think to try this:
  1. Add another hour of burst for 4 hours of 156W, wait a week.
  2. If that doesn't work go back to 3 hours burst, and drop the light 1" and wait a week.
  3. If that doesn't work, add another hour of burst, and wait a week.
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Last edited by sundragon; 11-02-2012 at 09:37 PM.. Reason: additional information
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