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#1
12-05-2007, 09:06 PM
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What are you measureing with?
Just worndering the actual instrument as I might be interested in getting one j BTW: Doug great to finally put a face to the name  
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#3
12-05-2007, 09:53 PM
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the MH were 14K bulbs (didn't have any 10K for me to try, but they would have been a higher reading if they were 10K. Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*Some strive to be perfect.... I just strive.
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#4
12-05-2007, 10:12 PM
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Correct me if I'm wrong but it wouldn't matter if your testing 2 3 or 4ft bulbs against the MH. Your not reading the par for the entire tank, just the area below the bulb.
Wouldn't testing an area between the two MH bulbs show something quite different for par? It wont change with the T5 over the length of the fixture. My concern for a test like this is color temp and reflectors. Scott
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#5
12-05-2007, 10:27 PM
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but heres the thing, a MH will effectivly light a 2ftX2ft area (just to pick a size). in this area you will have a center of about 1ftX1ft (At a specific depth) that will be brighter than the other area but only slightly and the dimmer area (if you can call it dimmer) will still have more intensity than a T5 output. the main think to look at is on deeper tanks, as you go deaper the socalled hot spot of a MH increases in size so you get a wider coverage that is even. where I do think the T5's would be perfect for is shallower coral tanks with lower light types (I am not saying you can grow high light corals under them as we have seen them grow under a NO bulb befor) or I think they would be a very smart purchase for a FOWLR where you just want the color to make the fish pop as it would be even everywhere. I am not claiming that MH is a nice even lighting, but rather people seam to think if you are not right under the bulb there is no output, where in reality you can't be more wrong about that. My old tank (1/2 of a 180) hade over 350 units of par in the corner on the bottom (24" +6" of air and offset 4" behind the bulb and 12" to the side) with the lighting I had then, the T5's didn't make that directly under the bulb at 6.5" Steve
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*everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*Some strive to be perfect.... I just strive.
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#6
12-05-2007, 10:30 PM
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That's interesting. What type of reflector were the t5's using? Or was this bulb only (i.e. no reflectors or glass in the case of the MH HQI).
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32"x32"x20" Cube-ish tank
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#7
12-05-2007, 09:51 PM
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Steve
__________________
*everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*Some strive to be perfect.... I just strive.
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#8
12-05-2007, 11:43 PM
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 and what a face it is. There,s a story behind the pic, but thats for another thread.Steve, I agree with fkshiu but cant argue against your answers. Sheez, no wonder I look like that.  I still think its an unfair comparison, as the idea is to light the entire tank and then measure par in the tank, which would require multiple bulbs and good reflectors. I still also say one needs to run a quality halide. Some of the cheaper higher "k" bulbs dont even come close to the intensity in my tank from just four T-5,s. How do I know? I ran them. In real life and not metered measures, my sps corals are growing fine and have good colour. They did not do that under halides, for me. And my tank is 2ft. deep, although I dont have any on the bottom, which I could running halides. But then I still only run 4 bulbs. Anyways, have to go and think of somemore points to try make. I do appreciate you going out and doing the measures for us.
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Doug
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Hybrid Mode
