Enough light?

[JorgePerez]

Hi,
I have a 65 gallon tank with a 150 watts 20,000 Ã"šÃ‚ºK HQI pendant. My sandbed is aproximately 4-5" high.
I was wondering if I am able to mantain a crocea or a squamosa clam with this lighting.

Thanks in advance.

 

[melev]

Typically, every 2 square feet is what one MH bulb can light up. Is your 65g a cube, or long like a 55g?

How high is the pendant over the water, or better yet, how far does the light have to penetrate to reach the spot you want to put your clam?

 

[JorgePerez]

My tank is 4' long. I know I need more light but here in my country it is very difficult to get at a reasonable price.
In fish stores they want $1000 dollar for only a 175 MH bulb with ballast !
The pendant is 10" over the water surface. I can place tha clam anywhere below de pendant. I have no corales there for the moment (also difficult to get here and very expensive).

Thanks.

 

[SharonFay]

I read in Daniel Knop book that recommended K rating is 5500 to 10K for clams.

I like the 10K over my tank, thought the 20K were to blue.