what if?

[tgrindle]

if I take the two 40 watt strip lights off would 2 x 175 m/h 14k lights be enough?\ on the 75gal?

 

[radar!]

it depends what you want to grow iniside... 8)

 

[Juck]

you can grow pretty much anything you like in a 75 with 2x 175w halides.

 

[tgrindle]

with the two m/h i have 5 watts per gallon, so I thought they would be enough.

 

[SnowManSnow]

I think its marginal..at 5 w.. but JMO

 

[Juck]

>>I think its marginal..at 5 w.. but JMO

If you had 350w of PC lighting over the same 75g tank there would still be 5 wpg but way less 'useable' (for want of a better word) light than with 350w of Halides.

Watts Per Gallon is a useless method for measuring reef lighting.

My friend has 3x250w 20k Halides over his 180g SPS/Clam setup,,,, an absolutely stunning tank and only 4 watts per gallon.

 

[PeeJ]

Why not go with 250? Heat increase would be marginal, as well as the price increase.

What is the typical/general water depth a 175 watter can effiectively punch through?

 

[tgrindle]

but I have TWO 175x14k bulbs on it now

 

[Len]

175W should be enough, although I wouldn't place light-demanding organisms near the bottom. Generally, I find 175W will work well up to 18" of water, but the top 12" is where you can keep most of the good stuff

 

[Anonymous]

Len's post nailed it.



Louey