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Thread: Metal halide or T5 H.O? Reply to Thread
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Topic Review (Newest First)
01-19-2013 04:25 AM
markstr There are really so many factors that go into this. Location is also a biggie...
Depending on how tall the tank is, and how close the Halide is etc etc. will all factor into this.... Amano uses these on all of his tanks for yrs... Really depends on what your tastes are/ budget etc. Pressurized CO2 yes as a givin..
03-10-2012 05:08 PM
BlueJack
Quote:
Originally Posted by dazkeirle View Post
I use both, what people are omitting to mention though is that MH has a much nicer light to it. It is more natural and gives the cool ripples.
+1...no other light source can match that glistening effect. Just have to deal with the heat. Or go LED!!!
03-10-2012 02:08 PM
Kathyy The chart came from here.
http://apps1.eere.energy.gov/buildin...white_leds.pdf

Before I went with MH I had seen similar information but no idea where, it has been a decade.

There are a few smaller tanks journaled here with MH, very beautiful but operating on a razor's edge. Not something for a first timer to try. Go T5, your electric bill will be smaller and you can have the lights on for longer!
03-10-2012 01:34 PM
dazkeirle I use both, what people are omitting to mention though is that MH has a much nicer light to it. It is more natural and gives the cool ripples.

It is a bit of an algae magnet though, be warned.
03-10-2012 07:49 AM
samamorgan Way to necro a thread. That's interesting if true, but it's the only information i've read that shows figures like that. I cant give source links to refute it, because this was talked about months ago and i'm not interested in running around looking for more information.
03-10-2012 03:38 AM
jreich 150w of MH over a 36 bow is way to much light even if your using press. co2. you really dont need a ton of light to grow plants, whats more important is ferts and co2. not many people use MH on a FW tank for good reason... its total overkill. the less ligh you have the more managable your aquarium will be, the more light u add makes the balancing act with co2 and ferts a razors edge.
150w MH would be good to grow coral, but not FW plants.
for a 36 bow i would go with 1 T5HO dual bulb fixture. with that you should be able to grow just about anything.
03-10-2012 02:42 AM
James77
Quote:
Originally Posted by samamorgan View Post
Energy used converted to light:

Incandescent/Halogen: 10% light
Metal Halide: 25% light
Flourescent: 70% light

There are more factors, but this is the basic concept.

This is incorrect.




Quote:
Originally Posted by samamorgan View Post
Yeah, most of the energy that is not converted into light is converted into heat instead, so for that metal halide, 75% of the energy used is converted into radiation. This leads to more expensive cooling bills as well. Yet another thing to factor

Imagine a 150w incandescent

All of the energy, whether or not it is converted to light, will end up as heat. Flourescents and halides watt for watt will put out the same heat.
01-22-2012 10:32 AM
samamorgan
Quote:
Originally Posted by TedP View Post
Heat!

When the main lamp kicks on for my 30g it heats the room up uncomfortably. It doesn't really affect the water temp that badly but it's my office and I spend a lot of time there. For that, it's too much as well.
Yeah, most of the energy that is not converted into light is converted into heat instead, so for that metal halide, 75% of the energy used is converted into radiation. This leads to more expensive cooling bills as well. Yet another thing to factor

Imagine a 150w incandescent
01-22-2012 09:30 AM
TedP Heat!

When the main lamp kicks on for my 30g it heats the room up uncomfortably. It doesn't really affect the water temp that badly but it's my office and I spend a lot of time there. For that, it's too much as well.
01-22-2012 02:49 AM
samamorgan Energy used converted to light:

Incandescent/Halogen: 10% light
Metal Halide: 25% light
Flourescent: 70% light

There are more factors, but this is the basic concept.
01-22-2012 01:48 AM
apeddle There expensive to run eh? Because the drain so much power?
01-22-2012 01:29 AM
samamorgan
Quote:
Originally Posted by apeddle View Post
Yeah I did, seems like its going to work pretty well! I'd really like to get a metal halide on something but there just so friggin powerful.
And very costly to run.
01-22-2012 01:24 AM
apeddle Yeah I did, seems like its going to work pretty well! I'd really like to get a metal halide on something but there just so friggin powerful.
01-20-2012 05:50 PM
TedP Looks, like you already decided on T5. Good choice. MH would be too much. I run a 150 watt MH over my 30 tall with injected CO2 and it's way too much light.
01-20-2012 04:43 AM
apeddle I rigged up my own t5 ho sorta looks great though!
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