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Boomer · 06-14-2006, 02:50 PM

Interesting this post just came upm as I just posted on it the other day elsewhere. Here is what I said;

Phil Thackray, a electrical engineer and expert on this subject is a friend of mine. He has done all the calculations on a reef LED system. Phil let Chrarlie and Julian use some of it in their new book TRA III ( lots of new light stuff in this book). I have the whole unpublished article. It is excessively deep and technical. In short for those that have not seen it. Reefkeeping mag wanted it rewriten as it was to techncial. So it may end up in Advanced Reefkeeping, if it gets published at all. Phil seems to be MIA the last few months.

Phil calculated the cost to replace 2-250 W MH 14K DE and 2 110W VHO actinics on his 75 gal tank with white LES's. He used a Li-Cor 192SA PAR sensor and measured his current lighting system. He measured 450umol/m2/s halfway down the tank on the birghtest spot. His calcualtion gave he could get 456 umol/m2/s at the surface. The cost for the power supply, circut boards, reflectors, associated parts and labor to asemble this LED array would be $5,000.00

There will/may be a heat issue. High wattage LED's, like 5 watt ones, produce allot of heat. A hobby of mine is collecting flashlights and a small flashlight with just 1 5 watt LED gets very hot. Many of these or those with more than 1 5 watt need heat-sinks built ( the design of the flashlight body) into the flashlight. Lower wattage LED's don't have much of an issue you just need lots of them

Phils test sytem;

An array of 600 diodes/reflectors consuming 720 Watts of electrical power. The LED's are 1.2 W and each LED can put out 21 lumens/watt.

I have the unpublished paper sent to me for review

06-14-2006, 02:50 PM	#8 (permalink)
Boomer Reef Sanctuary's Mr. Wizard Join Date: Nov 2003 Location: Duluth, Minnesota Posts: 2,070 View Gallery Karma Komment	Re: LED lighting Interesting this post just came upm as I just posted on it the other day elsewhere. Here is what I said; Phil Thackray, a electrical engineer and expert on this subject is a friend of mine. He has done all the calculations on a reef LED system. Phil let Chrarlie and Julian use some of it in their new book TRA III ( lots of new light stuff in this book). I have the whole unpublished article. It is excessively deep and technical. In short for those that have not seen it. Reefkeeping mag wanted it rewriten as it was to techncial. So it may end up in Advanced Reefkeeping, if it gets published at all. Phil seems to be MIA the last few months. Phil calculated the cost to replace 2-250 W MH 14K DE and 2 110W VHO actinics on his 75 gal tank with white LES's. He used a Li-Cor 192SA PAR sensor and measured his current lighting system. He measured 450umol/m2/s halfway down the tank on the birghtest spot. His calcualtion gave he could get 456 umol/m2/s at the surface. The cost for the power supply, circut boards, reflectors, associated parts and labor to asemble this LED array would be $5,000.00 There will/may be a heat issue. High wattage LED's, like 5 watt ones, produce allot of heat. A hobby of mine is collecting flashlights and a small flashlight with just 1 5 watt LED gets very hot. Many of these or those with more than 1 5 watt need heat-sinks built ( the design of the flashlight body) into the flashlight. Lower wattage LED's don't have much of an issue you just need lots of them Phils test sytem; An array of 600 diodes/reflectors consuming 720 Watts of electrical power. The LED's are 1.2 W and each LED can put out 21 lumens/watt. I have the unpublished paper sent to me for review __________________ Boomer Want to Talk Chemistry ! The Reef Chemistry Forum Want to See More ! The Coral Realm If you See Me Running You Better Catch-Up An explosion can be defined as a loud noise, accompanied by the sudden going away of things, from a place where they use to be.