Par meter in use? And question about lighting.

Discussion in 'Equipment' started by Bruce Spiegelman, Mar 8, 2017.

  1. Just installed a new fixture over my frag tank and would love to borrow the PAR meter so I can figure out what height to adjust it too. Also love to take opinions on this in the meantime.

    Its a 25 gallon frag tank. 16" deep. The fixture is a 4 bulb ATI T5's with two Reef Brite XHO LEDS on either dise. How high should I adjust it over the top of the water for now so I don't shock the corals. It's replacing a 2 bulb T5 reef bright hybrid with a single XHO. The Reef Brite fixture was 8" off the water.
  2. Coral reefer

    Coral reefer President

  3. Thanks!
  4. Gablami

    Gablami Supporting Member

    I have the par meter now. Here's a line to use next though. Signup at the par meter borrowing thread.

    Sent from my iPhone using Tapatalk
  5. Thanks -- forgot it had a seperate thread.
  6. Newjack

    Newjack Guest

    that's a lot of light for a 25 gal. tank
  7. Yeah --- I went back and forth on whether to pick it up, but the price was right. And it looks pretty bad-ass.......
  8. Just an update. I spoke to ATI directly about the light and since it's primarily going to be over SPS they thought it was a good fit. They did day to start it at 18-22" off the water line though! Then bring it down about an inch a week till I find the right spot.
  9. Coral reefer

    Coral reefer President

    If you double the distance you get 1/4 the light. You doubled the light, so I say 1.5 x the distance should be pretty close to what you had
    Bruce Spiegelman likes this.
  10. That's good knowledge! Thanks.
  11. rygh

    rygh Supporting Member

    Note that you can also just run with 3 bulbs for a while until corals get used to it.

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