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Old 01-22-2013, 06:49 PM   #251
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Quote:
Originally Posted by Robert_ellis View Post
No no... He said put 3 1w as opposed to 1 3w. It wild reach the bottom better.
If that was the case, why is everyone going to the 2 and 3 watt chips? No one is using the 1 watt diodes any more...except for Marine land, that is.
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Old 01-22-2013, 07:05 PM   #252
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I don't know but we have this huge electronic store down the road from my house that sells everything. Told me cheaper ways to do led setups and all kinds of stuff but said that. I was tripping out. Told me Cree bulbs are the same as all the other 3w in quality. It's just another brand. He was the led expert there though.
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Old 01-22-2013, 07:06 PM   #253
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Yea I was talking about how long the light was its 32 in long and 8 in wide it's a good light I hear
Oh ok. I gotcha... Ill check it out.
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Old 01-22-2013, 07:11 PM   #254
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I'm not sure about that. I don't have any hands on evidence that they are better or the same, but people are saying (and again, I'm not seeing any hard data on this) that the Cree chips are more potent. A lot of the stuff you read on the net is copied and pasted from other sources, and some of the information is hearsay. I'm done falling for that without PAR numbers or even PUR numbers to back that up. Btw, Of all of these LED reviewers out there, I have yet to see one post actual PUR numbers. This is probably due to the fact that a meter to measure PUR is about $3500.00 last time I checked.
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Old 01-23-2013, 12:30 PM   #255
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You would think a manufacturer would get one though to back how their bulb is better. I am also surprised with how much money is spent in this hobby that no one has bought one.
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Old 01-23-2013, 12:39 PM   #256
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IMO a one watt vs a 3 watt led, let's make this in a layman's perspective comparing 1000 penlights vs your car headlight, now which one can go farther? I'm sorry if I'm lost I didn't read previous pages
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Old 01-23-2013, 01:04 PM   #257
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Companies like Cree barely feel the reef hobby. The bulk of their customers don't care about PUR or PAR. It's up to a Reef or Hydroponics company to purchase a PUR meter.
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Old 01-23-2013, 01:16 PM   #258
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I've used some of the cree LEDs, mainly the xpg ( their most efficient and most powerful led).

I had some 100w chips (20 of 5w xpg)that were putting out 13000lumens, pretty bright! They don't have par / pur ratings though.

I think you're "experts'" advice is questionable, better to consult the guys on here who are actually using the LEDs for lighting a reef and are having success.
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Old 01-23-2013, 01:20 PM   #259
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BTW, look what Cree is doing lately...When are we gonna see these babies in our fixtures?
Cree XLamp® XM-L Color LEDs | Mouser
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Old 01-23-2013, 01:21 PM   #260
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If you local LED expert said 1W can get deeper than 3W then he really shouldn't call them "expert"
1w LED can never reach 1W in the sense of if you run it at max current, those LED will burn out lke very quickly. Same thing for 3W but 3W can run with a bit higher current and reach higher Wattage.
The distance that different light can travel depends on
1) The optic they using, the smaller the number the farther the light can reach.
2) When optic are the same, it depend on the light output of the single light source. IE: when 1W can reach about 0.6W~0.8W, 3w LED can reach 1.5W~2.8W depend on current running thru them. That alone has higher single point of output.

As far as for the PAR meter, I just purchased my PAR meter, I don't like to use the factory reading as I found most of the time they are somewhat misleading. I am only using them before as I had no other details. Now as I have my own PAR meter, I cna provide more accurate stats and that should help me provide better service to my client. I am even thinking getting a spectrometer. Those cost 7k~9K brand new, so I am waiting for one of my buddy to hook me up with some tech lab where they have used spectrometer. With those 2 equipments, I think I can better understand more about LEDs
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