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Old 05/06/2007, 09:14 PM   #1
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Location: North Carolina, USA
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How many LUMENS for a 75g reef tank?

This whole lighting thing is turning out to be more confusing than anything else. I'd like to start adding some corals to my tank, but I want to get the lighting right first. Don't confuse me with MH/PC/VHO, and all that stuff... I just want to know how many lumens (not watts) I need for a 75g reef tank.

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Old 05/06/2007, 09:40 PM   #2
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This may help

All lights area sold by watts. And really depends on type of coral you will want. All softies will live in high PC ( power compact ) lighting. Where LPS and SPS require T-5 or MH ( metal hilide ). But my t-5 dont seem to support some LPS. Decide on your budget then your stock and this will help with your purchase.

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Old 05/06/2007, 09:53 PM   #3
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My budget is unlimited, I just want to make sure I have enough lumens for coral. On the other hand, I don't want to have to buy a chiller because of the heat from the MH.

I'm probable going to customer make a canopy. There has to be a rule of thumb on lumens. If I can get enough lumens with VHO lights, I'll go that way. I just want to know how many lumens I need.

By the way, watt for watt, MH puts out more lumens than VHO and PC, and they put out more lumens than standard flourescent. Correct me if I'm wrong, but the corals couldn't care less about how many watts I'm running through the fixtures, they just want the brightness (lumens), right?

They also want the proper spectrum, too, but I can do that with HO or VHO lights.

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Old 05/06/2007, 10:08 PM   #4
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Location: In Quebec, Canada
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Originally posted by demonsp
But my t-5 dont seem to support some LPS.
I guess too much light.

2 black Onyx, 2 P. cardinal, 3 Lyretail anthias, 1 y. watchman goby, 1 Foxface, 1 Lieutenant Tang, 1 Mandarin, 5 clown gobies, 3 chromis

Mixed reef

Alk 8.5, Ca 400, Mg 1250, SG 1.025, PO4/NO3 0

Current Tank Info: 110G display, 50G refugium, 180 LBS LR/BR, 120lbs sand, Vertex 250 Skimmer, Phosban reactor 300W heater, 333W T5HO, OR3500 return , 4 Tunze 6025 @ 4800GPH, 8w UV, RO/DI
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Old 05/06/2007, 10:28 PM   #5
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I think you might have watts, lumens, and PAR confused a bit. Corals really care about PAR. Halides on a good reflector are going to put out the best PAR closely followed or even equal to are T5, then VHO, then PC etc.. All depends on how many lamps you run and the wattage of course. Here's what I would do.... I would come up with a list of the corals you want to keep first, then we can help you with your lighting needs. Softies don't require near the light of SPS and so on. Start there and let us know.


180g Marineland Starfire In-Wall 278 gallon system
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Old 05/06/2007, 10:50 PM   #6
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I would just order this retrofit you could keep anything with this combination

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