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Old 12-18-2012, 01:31 AM   #11
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Please make sure don't go nuts and turn on the light to full intensity, other wise you will bleach your coral in less than a day.
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Old 12-18-2012, 02:08 AM   #12
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I won't, I'm gonna probably keep the fixture running at about 70%, the optics are 90 degrees
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Old 12-18-2012, 02:48 AM   #13
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Both units have 120 degree optics. Its the standard primary lens for LED.
This is correct, the LEDs have by default a 120 deg. Lens. It's the clear plastic hemisphere over the chip. Nearly all LEDs have a 120 deg. Lens built in. Some Crees have 60 or 90 as an option. If you want 90deg lenses on your 120 deg led you'd buy a little lens that snaps on to the led.
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Old 12-18-2012, 10:45 AM   #14
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70% may still be a bit high just keep a super close eye to every coral and every polyp on the coral to make sure it's healthy.
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Old 12-19-2012, 02:26 AM   #15
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Originally Posted by Saratj1 View Post
This is correct, the LEDs have by default a 120 deg. Lens. It's the clear plastic hemisphere over the chip. Nearly all LEDs have a 120 deg. Lens built in. Some Crees have 60 or 90 as an option. If you want 90deg lenses on your 120 deg led you'd buy a little lens that snaps on to the led.

It depends on the fixture to be honest, I have talked to many LED manufacturers and all of them provides me 60 degree lenses as default and 120 degree was not an options, even if I ask them. I also don't see why you want to spread the light to 120 degree at the same time for your tank. A LED fixture suppose to work best at 90 degree with about 6 to 8 inches above your tank.
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Old 12-19-2012, 04:02 AM   #16
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It depends on the fixture to be honest, I have talked to many LED manufacturers and all of them provides me 60 degree lenses as default and 120 degree was not an options, even if I ask them. I also don't see why you want to spread the light to 120 degree at the same time for your tank. A LED fixture suppose to work best at 90 degree with about 6 to 8 inches above your tank.
Here's what I'm talking about. In this first pic of a led , the clear plastic bubble on there is a 120deg. lens



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If you add another lens like this second pic, that's different, but by default they generally come with 120deg.
This pic is not what I'm talking about, below



Name:   image-4061583328.jpg
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Size:  37.9 KB
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