Metal halide level from the surface !

[Faisal1976us]

Hi ,,,,

I have sps tank (40 in long X 20 in high X 20 in width) and i have metal halide 250w 14000 k with 2 blue actinic t5 , my question is can i put the distance between the water surface and the halide 10 in ? ( i have sps also in the bottom of tank )

[Rysam]

my 250 bulbs are closer to 16 inches from the water and stuff grows fine most everywhere and i also have several clams on the sand that are quite happy.

[mpoletti]

10 inches from the surface should be fine. I think my bulbs ae right around 11" from the surface of my water.

[cham]

I keep mine at 4"

[Salamander]

I'm at 7".

[cham]

<a href=showthread.php?s=&postid=13909619#post13909619 target=_blank>Originally posted</a> by Salamander
I'm at 7".


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:D

[GSMguy]

6"

[Toddrtrex]

Assuming that you don't have to worry about the bulbs being splashed, I would think what ever height works best for you -- taking into account the reflector you are using, and how much hot your tank gets.

For my 58, the lights (( a full fixture )) sits right on top of the tank.
75, hanging full fixture is about 5 inches off the water.
29, Current Sunpod -- using the legs, about 4 inches off the water.

[Faisal1976us]

Im using ARCADIA bandent 2x 250w
http://www.arcadia-uk.info/product.php?pid=60&mid=11&lan=en&sub=&id=4

i think its have small reflector , so did you think that ok if i keep the distance between the halide and water sarfece 10" for 20" deep tank ?

[kev apsley]

6-10"

[crvz]

You should be fine at that height, but just watch the coral response. If they seem to be lacking light, lower the fixture.

[myrchandle]

Im @ 10" w/a 400w bulb.

[Dave's Reef]

Dead center of my single ended 175 20K's are 8.5" above the water.

Just worked out that way.... Everything in my tank does well.

[dv0920]

7.5 n 3/8 j/k I think its like 7 or 8.

[johnny313]

it all depends on your reflectors and wattage of the bulbs

[mannyhernz]

does the type of bulb make a difreence?....wether it is SE or DE? (mogul base or hqi)


<a href=showthread.php?s=&postid=13925111#post13925111 target=_blank>Originally posted</a> by johnny313
it all depends on your reflectors and wattage of the bulbs

[t5Nitro]

I keep reef optix III 250w halides 3" above the water surface only because that's what my canopy allows. It has no negative effects though.

[reefer31]

my 250 14k de bulbs sit around 16" if i can remember right, no ill effects