how many 400 watt mh for a 210 sps

[High Plains Reefer]

I have 5 I'm hoping that 2 will be enough I am planning on a sps tank

 

[aztecdreams]

how many 400 watt mh for a 210 sps

It's usually 1 for every 2 square feet of tank. So 3 on a 6' tank

 

[coloagro]

The magic number when dealing with MH is watts per gallon. They say 3.5 watts per gallon is BARE minimum but shoot for 5-10 watts per gallon. At 5W pg your looking at 1050 watts. So roughly 3 400 watt units. Really depends on your dimensions, depth etc. If you post the dimensions of the tank and the type of fixtures you have I'm sure more people will chime in. GL!

 

[High Plains Reefer]

the tank is 7'x2'x2'I have a selection of fixtures I can use including a 6 foot hood that I could put 3 or 4 in if wanted I also have 2 of the old aquamedic dual halide hoods that are 3 foot long or 3 batwings I have been kicking around just buying 3 new vented grow style hoods too

 

[that0neguy1126]

i would probably do 2 400w and 2 250w on a tank like that.

However, at this point, I would be considering LED due to the cost of keeping 1500w of MH online.

 

[newtoreef]

how many 400 watt mh for a 210 sps

At 240volts running at 12 hours a day it comes out to 40-55 $ a month at 120volts comes out to 100-130$ a month!


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[High Plains Reefer]

who runs halides 12 hours a day? I thought it was 6 max

 

[xxHLTxx]

who runs halides 12 hours a day? I thought it was 6 max

if i run my 400w more than pretty much 5 hours then i will melt mushrooms on the bottom of the 75g...

 

[newtoreef]

how many 400 watt mh for a 210 sps

Just saying for price lol



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[newtoreef]

how many 400 watt mh for a 210 sps

So 6 hours a day at 240 would be 25-35 $ a month


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[djkms]

I run 3 250's on my 225 (72x27x27) I think my PAR numbers are pretty good. Granted I also run T5's as well. Its all about the reflectors IMO. Here are my numbers:

And my reflectors:

LumenMax Elite – Mogul

• High performance 95% reflective European aluminum reflector
• Rust-proof and light-weight aluminum frame
• Quick release mounting bracket
• Adjustable socket to center different lamps
• Adjustable lamp cord positioning
• Can accommodate 175, 250 and 400 watt lamps

 

[Zooid]

I had 3 on a 7 foot long 200g tank and that was plenty.

 

[jda123]

I would use all five. I would run the two outside and the center for normal periods (X below). I would fire up the two in-between for 2-3 hours a day to simulate high noon (o below). You are basically talking about 1KWH for the 2 extra (500w each with heat and stuff?), so 8-10 cents an hour - or 24-30 cents a day if you run them for 3 hours. Bulbs would last for 3 years with this kind of interval.

XoXoX

I have used 4x250w HQI and 2x150w HQI over a standard 120 (4x2x2) with excellent results with SPS and Clams.