Halides....How High?

[bluetmax]

I just had a question I wanted to run by those using halides. How high above the water do you have them mounted? Is there a general rule of thumb? Just wondering....Thanks in advance!

 

[bigloggerhead]

I've always heard at least 12 inches from the top of the water. My bulb is exactly 11.5 inches from the water. Hope this helps.

 

[gpep419]

i always did 8in for 150w 10in for 250w and 12in for 400w

 

[bluetmax]

The tank is 25.5 inches deep.

 

[bluetmax]

One more thing.....I am hanging a 400 watt pendant.

 

[pezcubano]

I've always heard 10-12 inches, otherwise you risk burning the corals. That jives with what everyone else is saying here.
With a 400W I would go higher rather than lower. At least at first.

 

[bertoni]

I've used anything from 3-4" to 8". For that big a bulb, I'd probably start fairly high. A lot depends on the reflector.

 

[ReefForBrains]

I would start high, then bring down an inch a time and keep an eye on the temp.

I personally run as close as possible to water surface without pushing too much heat.

Surface agitation and cross breeze via small fan can make a world of difference for heat and evap. JMO

 

[ReefForBrains]

High as being 15-18 inch to start with for the 400w. Dont underestimate thier output and heat. Keep checking and adjusting as needed.