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Old 05-26-2005, 03:14 PM   #1
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Light information

I emailed Marineland to get the specs of my common 15 watt 18" T8 "Eclipse Natural Light" bulb. These come standard in a lot of dual hood 55g set-ups, such as the Top-Fin 55g combo one they sell everywhere. Here they are:

750 Lumens
5200K Kelvins
69 CRI

By comparison, here are the coral-life 50/50 bulbs I ordered:

1100 lumens
92 CRI

Since this info is for just one of the two bulbs in the set-up, I'm expecting a pretty good increase in light. Hope this helps someone. BTW, can someone let me know what CRI is?
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Old 05-26-2005, 04:44 PM   #2
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You haven't gotten the 50/50 lights in yet? Wait, didn't you order them without reflectors and had to change it to with reflectors? When do they come in?
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Old 05-26-2005, 04:47 PM   #3
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BTW, can someone let me know what CRI is?
http://lightingdesignlab.com/articles/cri/cri.htm
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Old 05-26-2005, 05:23 PM   #4
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You haven't gotten the 50/50 lights in yet? Wait, didn't you order them without reflectors and had to change it to with reflectors? When do they come in?
Yeah, the without came yesterday and I'll be sending them back today. The with will come next week.
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Old 05-26-2005, 05:30 PM   #5
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BTW, can someone let me know what CRI is?
http://lightingdesignlab.com/articles/cri/cri.htm
Thanks for the great link. I really am making a big upgrade then!
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Old 05-26-2005, 06:16 PM   #6
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Actually I think they screwed up the picture on the right side of the page. The CRI 85 chart looks worse than the CRI 70 chart.
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Old 06-02-2005, 03:44 PM   #7
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I got the 50/50 bulbs today and they are really dim. I am going to return them, they made my tank look worse, not better. I ordered this setup instead, I think the double 48" bulbs are going to really make my tank look much better than the two little 18" I'm using now.

http://cgi.ebay.com/ws/eBayISAPI.dll...ME:B:EOTB:US:6
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Old 06-02-2005, 04:41 PM   #8
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The CRI is the Colour Rendition Index, which tells you how close to natural colour things will look under that particular light. Natural sunlight would be 100. It seems that most people want a light that suits their eye rather than one that makes everything look natural. Two 48" tubes will obviously give you much more light. The other adavantage to 48" tubes is that there is a ton of choices as far as types of tubes available, and they tend to be cheaper.
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Old 06-02-2005, 09:04 PM   #9
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Tony- Big Al's sells that light strip without the glass canopy for $78.99. I think someone on this site said they bought the glass canopy for $20. It might be something to look into.
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Old 06-02-2005, 10:38 PM   #10
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Tony- Big Al's sells that light strip without the glass canopy for $78.99. I think someone on this site said they bought the glass canopy for $20. It might be something to look into.
I saw the same glass top but for a 10 gallon tank at PetCo for 24.99. I'm not holding my breath about finding the glass top for a 55 gallon for cheaper somewhere.
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