MH height from water level

Fatboy · 07/03/2006, 05:02 PM

A friend of mine has a 20" tank (height) and he has 2 x 150 watt DE MH's.

He just bought a Crocea clam and he is worried that the clam is not going to have enough light. His lights are 12" from the water surface..... how much he can lower them in order to be able to get more PAR ? He has a glass that covers the lamps so splashing wouldn't be a big problem.

Chaotic Reefer4u · 07/03/2006, 05:12 PM

salutations fatboy, i would recommend you tell your friend to put them 8, inches above the water line as these 150's are not as powerful for the clams needs, hope this helps...

TellyFish · 07/03/2006, 05:16 PM

My 2x150w 10k are really close to the water (like 6in or less), but I am not sure what dangers that might promote. Tempered glass shield for sure.

bertoni · 07/03/2006, 05:49 PM

I've had a 150 W fixture about 3 " above the water surface. That's the shielding glass, not the bulb. At some point, the tank might start to heat up, and the shielding glass will require more frequent cleaning. Those are the only issues that come to mind.

easye123 · 07/03/2006, 06:25 PM

Quote:

Originally posted by ChAoTiCrEeFeR4U
salutations fatboy, i would recommend you tell your friend to put them 8, inches above the water line as these 150's are not as powerful for the clams needs, hope this helps...

Thats plenty of light...i know tons f people with 110w t5's that have many clams like that and r doing perfect...

i have one 150w DE. and its keepin clams like a champ

Fatboy · 07/04/2006, 07:23 AM

Thanks for the answers.......

I told him to lowere his lights to 8" to start (off course by lowering them slowly in order to not stress the corals....)

07/03/2006, 05:02 PM	#1
Fatboy Registered Member Join Date: Nov 2002 Location: Chile Posts: 399	MH height from water level A friend of mine has a 20" tank (height) and he has 2 x 150 watt DE MH's. He just bought a Crocea clam and he is worried that the clam is not going to have enough light. His lights are 12" from the water surface..... how much he can lower them in order to be able to get more PAR ? He has a glass that covers the lamps so splashing wouldn't be a big problem.

07/03/2006, 05:12 PM	#2
Chaotic Reefer4u ♥Acropora Aficionado♥ Join Date: Jul 2004 Location: Hollister,Ca. Posts: 5,163	salutations fatboy, i would recommend you tell your friend to put them 8, inches above the water line as these 150's are not as powerful for the clams needs, hope this helps... __________________ Live everyday as if it was your last, take time to smell the flowers, enjoy all things living, never take anything for granted, you just never know when your number might be up... Current Tank Info: * 90g. Reef Ready TruVu tank with 30g. Platinum Filtration Series Sump SpS Acro enthusiast *

07/03/2006, 05:16 PM	#3
TellyFish Registered Member Join Date: Feb 2006 Location: Chicago 60607 Posts: 1,130	My 2x150w 10k are really close to the water (like 6in or less), but I am not sure what dangers that might promote. Tempered glass shield for sure. __________________ ...and life spirals into astonishing diversity. Current Tank Info: Hawaiian inspired 109g Miracles Rimless - 100g Prop Tank - 300g total system volume

07/03/2006, 05:49 PM	#4
bertoni RC Mod Join Date: Mar 2002 Location: Mountain View, CA, USA Posts: 88,616	I've had a 150 W fixture about 3 " above the water surface. That's the shielding glass, not the bulb. At some point, the tank might start to heat up, and the shielding glass will require more frequent cleaning. Those are the only issues that come to mind. __________________ Jonathan Bertoni

07/04/2006, 07:23 AM	#6
Fatboy Registered Member Join Date: Nov 2002 Location: Chile Posts: 399	Thanks for the answers....... I told him to lowere his lights to 8" to start (off course by lowering them slowly in order to not stress the corals....)