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10-04-2010, 08:28 PM
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#44
08-31-2010, 05:58 PM TheDogFather Member Join Date: Sep 2009 Location: Ajax, Ontario Posts: 28 Quote: Originally Posted by Ron99 Any updates or more then and now photos? Personally, I'm not super impressed with the PAR readings you showed so far. For optimal growth of SPS you want between 400 and 500 PAR. My DIY LED array achieves that in the middle level of the tank (10 inches down my 20 inch deep 75 gallon) at less then full power with the array 6 inches above the water. If I turn it all the way up and lower to 3 to 4 inches above the water I get way more. I get well over 250 PAr at the sand bed 18 or 19 inches below the water surface. Your clam may do alright but as I understand it clams need 250 to 300 PAR (I may be wrong on that but it's the number I recall). That's nice Ron99 but this is not a contest and what makes you think you need between 400-500 PAR to grow stony corals well? My SPS and clams say otherwise. I'm not going to get into a PAR contest with your DIY fixture, I get excellent growth (at 50% power I might add) and my clams are growing very well. The 48" Vertex Illumina LED comes very close in PAR output to my previous fixture, ATI PowerModule with 8x54W T5's and that fixture is no slouch. I'm guessing your DIY uses optics to achieve higher PAR values but at the cost of spread so you'll have to hang it high to get decent coverage thereby negating all that extra PAR... -TDF "Stoney corals appear to photosaturate between 400 and 500 PAR so having 700 or 1000 PAR is probably pointless other than for bragging rights. I doubt it will do the corals much good." -Ron99 could not have said it better myself 
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