PDA

View Full Version : 175W or 250W MH???


hammer294
10/23/2006, 10:15 AM
i am putting together a 20 gallon high tank and going with MH. I was wondering which is best to go with, the 175w or 250w???

DrBegalke
10/23/2006, 11:57 AM
If its 20" or deeper, then 250w in my opinion.

hammer294
10/23/2006, 01:56 PM
it is 16" tal, 24" wide and 12" deep

crispyreef
10/23/2006, 02:09 PM
You will be fine with 175's because it is not a deep tank. What are you hoping to house in there?

dmo
10/23/2006, 02:10 PM
I was also wondering about a 250w on a 16" tall tank.. in my case, 30g. How high would it have be hung to be safe?

I'm planning for a 75g in the future, and would use the 250 for that. (along with another 250)

hammer294
10/23/2006, 07:23 PM
<a href=showthread.php?s=&postid=8399003#post8399003 target=_blank>Originally posted</a> by polypmonkey
You will be fine with 175's because it is not a deep tank. What are you hoping to house in there?

i am looking for zoas, and softies to be housed right now, but am sure i may get hit with a bug to get a clam or sps.

down the road i may move into a 55 i have laying around in the garage as well.

jimbo045
10/23/2006, 07:51 PM
175s seem fine. JD

Scissorhand
10/23/2006, 07:58 PM
250w for a 12" deep is overkill.

reef_doug
10/23/2006, 08:28 PM
My vote is 175w (SE) as well. Save the energy.

If the tank was 24" - 28" than I would say 250w DE.

Best
Doug

hammer294
10/23/2006, 10:38 PM
sounds good with the 175w...one more question. I have a canopy plan for the hood which has the height of 8"-9" off the water. I estimate the MH light being roughly 5-6" off the water. I was planning on putting a fan pn each side for cooling and then go from there. Does this setup seem it will work or are the MH lights too clase to the water level???

humbugy
10/23/2006, 11:19 PM
175w

smp
10/25/2006, 07:07 AM
250

only for the reason that when you upgrade (and you will) you won't have to buy it again.
I'm paying for this mistake right now.
Something else to consider is that if you like higher kelvin lighting (20k) you will have very little PAR with a 175.

ADA33
10/25/2006, 07:53 AM
<a href=showthread.php?s=&postid=8411524#post8411524 target=_blank>Originally posted</a> by smp
250

only for the reason that when you upgrade (and you will) you won't have to buy it again.
I'm paying for this mistake right now.
Something else to consider is that if you like higher kelvin lighting (20k) you will have very little PAR with a 175.

I agree

luke30mm
10/25/2006, 09:26 AM
I currently have my 250w about 6" from the surface of the water and i havent turned on my cooling fan once (its not completely enclosed so there is airflow) IMO i believe you should be just fine with the lighting that you have planned

hammer294
10/25/2006, 02:11 PM
<a href=showthread.php?s=&postid=8412335#post8412335 target=_blank>Originally posted</a> by luke30mm
I currently have my 250w about 6" from the surface of the water and i havent turned on my cooling fan once (its not completely enclosed so there is airflow) IMO i believe you should be just fine with the lighting that you have planned


thats all i need to hear!!! i am going to go with the 250w. i will still put in 2 fans in the hood. one flowing in and one flowing out just incase. does anyone know quiet yet inexpensive fans to go with?

thanks for everyones help

ADA33
10/25/2006, 03:21 PM
Great choice I think this will save you money in the long run.

mikedsokc
11/13/2006, 10:01 PM
I had a 175 10k on a 29G and upgraded to a 250 20k. I am running two fans on the canopy and one fan on the sump. My temp runs about 76. I wish I had stated out with the 250. Use an icecap ballast to get a truer color and longer life out of your bulb.