Originally Posted by gooyferret
So lets think, we have the sun millions of miles away. Is it more a MH
or a T5HO, i know what your thinking its a MH
because of the single point of light. 8O Oh im digging myself in the hole now
but wait its not a MH
its more like a T5 because of the fact is
#1 the distance
#2 and it covers millions of square miles of ocean light is distributed evenly acrossed.
Heres another thought:
I have not seen any photometric reports on a MH
for aquarium fixture use from my work or never have seen it on the net.
but what i have gotten is:
400 watt MH
puts out 26,200 lumens.
6 bulb 54watt T5HO puts out 30,390 lumens
First off the comparison with the sun is utter and total hogwash!! Provide the MH
with enough wattage and raise it high enough off the tank....it is oviously a closer mimic to the characteristics of the sun. Neither will ever compare in intensity to the sun. BTW
, the lumens are barely more than worthless, unless you know the par of each individual bulb...you cannot say which is "better", if there is such a thing. It is important to remember that with each lighting breakthrough, it adds another tool in our arsenal. Each has a use, some are suited to certain things better than others. It is my opinion that any tank over 24" tall should have nothing less than 400W MHs on it, if you want to keep corals, anemones or clams that have any need for moderate to high light. For shallower depths, the choices just keep getting better and more abundant.
Im sorry but i would have to disagree and let me explain. The first part is talking about depth of tank, well depth will matter and the water is the factor of that, not the lighting or lumen output. I know what your trying to argue but its still not relevant. Lets think about the sun for a minute for me to better explain. We all know the sun is the most abuntant and powerful light source their will ever be
The depth of the tank is extremely relevant, as well as the distance of the light from the water. Both the distance from the water and the depth of the water will reduce the amount of light that reaches the bottom of the tank.
A pinpoint source of light will penetrate further into the water than light that is spread out along 4ft of bulb. You want to use lumens...400W MH
26,200 lumens, 6 t5 hos does 30,000 (at lower K
ratings which will provide more lumens, your figures are wrong), at the bottom of a 30" tank....the MH
will provide more PAR and more lumens than the t5 hos. Simply because that is what it is designed to do.
, clams can be done in PC
, t5 ho
(I assume) or MH
, provided the intensity is high enough. Most recommend MH
only for clams.
Joey, if you want MH
and you only do one...pick which side you want to put it on, 55g has a center brace that will cast one hell of a shadow with one MH
centered over the tank. With centerbraces it's 2,3,4 whatever it takes to provide tank coverage.