Playing with PAR reader.

Discussion in 'Lighting' started by RiaanP, 9 Aug 2010.

  1. RiaanP

    RiaanP Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,165
    Likes Received:
    1,232
    Location:
    Centurion
    First thanks to Louis and Adriaan at Idol Marine to allow me to play in their workshop.
    I took my light units to test with their PAR reader. This unit from AquaMedic. Also a old school single reflector 4 tube unit I got.
    Reeftek tubes are Actinic and 12000K white.
    All readings taken 100mm away from tube. (pretend it is at water surface)
    Reeftek tubes are 3 weeks old and also used 6 months old AquaMedic tubes.

    [​IMG]

    I took my 3 week old Reeftek Tubes.

    First test. Reeftec in old light unit.
    Actinic 130
    White 135
    (Tested with 2 actinic on then thereafter with 2 whites on. I think I got reading from the globe below and some from the other tube. Should have shielded the other one)

    Same tubes in Aquamedic unit as above.
    Actinic 120
    White 140

    Conclusion. Not a lot different in using a single reflector per tube, or a combined reflector. :whistling:

    Test 2.
    Ok, what about no reflectors. So I removed the reflectors from the AquaMedic unit
    Actinic 53
    White 63.

    Conclusion
    Damn, I lost more than 50% light efficiency. So reflectors is a must. point proven.


    Test 3.
    So what about my 6 month old Aquamedic light tubes. Put them in the unit with reflectors.
    Actinic 330
    White 340

    Conclusion.
    Wow, old Actinic tubes are better than 3 week old Reeftek. Is that possible? Did I mess up somewhere?

    So to Test 4.
    Thank you Louis who lent me 2 brand new tubes. Both Actinic.
    Reeftek 200
    AquaMedic 333

    Conclusion.
    Cheaper does not work?

    Then Test 5.
    What do both these brand new units do without reflectors,
    Reeftek 89
    Aquamedic 128

    Conclusion.
    You need reflectors!!!!

    And test 6. Just for fun.
    150W mh 1976
    Off the scale....
    But take into account that a MH give a concentrated spot, where T5 gives can light the tank from side to side. And 200mm to the left or right and the MH reading drop drastically.
     
    Last edited: 9 Aug 2010
  2. AdS Guest




    to hide all adverts.
  3. vatso

    vatso

    Joined:
    3 Dec 2007
    Posts:
    1,733
    Likes Received:
    9
    Location:
    JHB
    MH as we saw is the way to go if you want good light & depending on the reflector can have spread light ;)

    I run 1 x 400W MH light on my 1m x 1m cube how many 54W T5's would I need to run? 10+
     
  4. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,165
    Likes Received:
    1,232
    Location:
    Centurion
    Vatso, yes, but on 200mm, the reading dropped to 736.
    33% as on 100mm

    Directly under, wonderfull,
    To the left, or right. hmmm.

    T5 give same reading from the left to the right...

    So yeah, on cubes, MH great, on long tank, multiple MH great.

    Tradeoff comes in when comparing wattage used.
     
  5. vatso

    vatso

    Joined:
    3 Dec 2007
    Posts:
    1,733
    Likes Received:
    9
    Location:
    JHB
    100% I like the one light idea or 2 lights - not so keen on 10 - 20 tubes.

    But soon LED's will be the new lights we use! start saving now LOL
     
  6. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,165
    Likes Received:
    1,232
    Location:
    Centurion
    yeah sure LED lights. Keep on dreaming. Not for another couple of years before they can deliver the PAR and at an affordable price. In meantime got to do with T5's and MH.

    I wonder what a 400W MH PAR readings would be, at 100mm, 200mm and 300mm into the water. You will be surprised at how quickly the reading goes down to double figures. And also what the readings will be at about 30 degrees away from directly under the globe. Also in nature, the sun moves over, so corals etc are used to get light from a side to side. With a single big MH, the sun stopped at 12. All growth is directly upward. And anything that spreads out a bit, totally put something next / under it in the shade. Well it happened under my big Pin Cushion. The Zoa colony almost perished. So multiple light units and sources in my opinion is better than one big mother of a light directly above.

    But purpose of the thread is to highligh how important reflectors are. And at the end, the difference between single and one combined reflector, is not that different. Well with my units.

    The difference between Reeftek globes and AquaMedic. Well that is totally another discussion. Do not expect a BMW M3 performance out of a Tata Indica. You get what you paid for...
     
  7. Manic

    Manic Moderator

    Joined:
    12 Mar 2009
    Posts:
    3,313
    Likes Received:
    58
    Location:
    Johannesburg, Edenvale
    I wish you could have tested giesemann lights.
     
  8. viper357

    viper357 Admin MASA Contributor

    Joined:
    4 May 2007
    Posts:
    27,991
    Likes Received:
    782
  9. viper357

    viper357 Admin MASA Contributor

    Joined:
    4 May 2007
    Posts:
    27,991
    Likes Received:
    782
  10. Midasblenny

    Midasblenny

    Joined:
    11 May 2007
    Posts:
    855
    Likes Received:
    10
    Location:
    Randburg-Gauteng
    Thanks Riaan, AM bulbs rock and those tested are 6 months old!
     
  11. ziyaadb

    ziyaadb

    Joined:
    18 Jul 2007
    Posts:
    5,566
    Likes Received:
    48
    Location:
    JHB-Lenzz
    wow man crazy
     
  12. neil.h

    neil.h

    Joined:
    9 Apr 2010
    Posts:
    344
    Likes Received:
    1
    Location:
    JHB
    Thanks for the results Riaan! The results are interesting to say the least.

    Interested in a second round of testing? Would be keen to try out some Sylvanias...

    What wattage is the unit? 54w?
     
  13. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,165
    Likes Received:
    1,232
    Location:
    Centurion
    Yip 54W.

    Would be interesting to use one light unit, like this Aquamedic unit, and with a bunch of different tubes. Say a lot 10000K and a lot actinic. Fit the PAR sensor into a jig, so that each measurement will be exactly at same distance.

    But then to be able to redo that same test with same tubes 6 months later. But the 6 months test will not be that sceintific correct as tubes will run different hours per day. Or we can ask reefers to also bring along 6 months old tubes to be tested on same day as the brand new ones.

    Now this is something interesting to do on the next Gauteng (Joburg or Pretoria) reefers meeting.
     
  14. mariusmeyer

    mariusmeyer

    Joined:
    7 Jul 2009
    Posts:
    3,055
    Likes Received:
    210
    Location:
    Jukskei Park, JHB
    So what is the retail on the AM actinic and 12000K tubes?
     
  15. mariusmeyer

    mariusmeyer

    Joined:
    7 Jul 2009
    Posts:
    3,055
    Likes Received:
    210
    Location:
    Jukskei Park, JHB
    Anyone got a price on the AM tubes?
     
  16. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,165
    Likes Received:
    1,232
    Location:
    Centurion
    Prices - well I phoned Adriaan - Idol Marine.

    the 10000K and Actinic is priced the same per make
    AquaMedi 308
    Reeftek 128

    Giesemans range from 240 (10000K) to 370 (Aquapink)

    Reeftek is more than half the price, but also more than half the PAR...
     
  17. mariusmeyer

    mariusmeyer

    Joined:
    7 Jul 2009
    Posts:
    3,055
    Likes Received:
    210
    Location:
    Jukskei Park, JHB
    Thanks man. Like you said. You get what you pay for.
     
  18. viper357

    viper357 Admin MASA Contributor

    Joined:
    4 May 2007
    Posts:
    27,991
    Likes Received:
    782
    Riaan, was there anything behind the tubes when you took the reflectors off?
     
  19. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,165
    Likes Received:
    1,232
    Location:
    Centurion
    The black carpet on the table top, where Adriaan builds his tanks.
    why?
     
  20. viper357

    viper357 Admin MASA Contributor

    Joined:
    4 May 2007
    Posts:
    27,991
    Likes Received:
    782
    I'm just wondering what sort of reflection a plain white surface gives, I would assume it would at least be an improvement on having nothing or a dull/dark surface behind the tube.
     
  21. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,165
    Likes Received:
    1,232
    Location:
    Centurion
    White is better than nothing. White is even better than aluminium foil. White gives a uniform reflection compared to a diffused into all directions you get out of foil because of the wrinkles.
     
Recent Posts

Loading...
Similar Threads - Playing reader Forum Date
This Child Was Playing With A Very Odd Friend And When I Realized What It Was My... JungleAquatics.NET BLOG 19 Jun 2015
What game are you playing Technology 1 Oct 2013
Not using a quarantine tank is like playing Russian roulette. General Discussions and Advice 17 Jul 2013
Dolphins playing with air rings General Discussions and Advice 21 Sep 2010
Testing and playing with the RO bubble blaster 5000 Protein Skimmers, Mechanical Filtration 10 Sep 2010
[wtd] TDS Reader Wanted 17 Feb 2014