Which T5 should I get

[i have crabs]

Originally Posted by Myka

With your tank being 21" deep you will be limited in what you can keep in your tank if you choose to go with T5s to a certain extent. Once you get past about 14-16" T5s don't compare to metal halide for intensity. You will be able to keep all softies, probably all LPS, and some SPS. If you want to keep certain types of clams, anemones, and SPS corals then metal halide would be a better choice. If you're ok with a few limitations, then the Tek fixture you chose should do quite well for you.

not completly true. going with a 4 bulb t5 id probably agree, 6-8 bulb fixtures have really good par. i have a par meter and have tested lots of lights and my 8 bulb tek fixture puts out better power at 27"down that most 250w halides ive tested by quite alot.

since your tank is 36" and only 21" high id say the a 6 bulb in either the tek or compact usa would allow you to keep almost anything you want, some sps probably would need to be in the upper 12" but most would be fine id think. a 4 bulb might not cut it for sps but lps and softies would be no problem.


im quite shure the compact usa lights with 4 and 6 bulbs have individual reflectors while the 8 bulb and the glo lights have 1 large relfector. you definatly want individual reflectors, imo the glo lights are junk as far as power goes thier cheep so people buy them and will defend them to the grave. i didnt even keep the 2 bulb glo light i bought on my qt tank made me crazy everytime id look at the tank
the 8 bulb compact usa with 1 reflector tested about 40% less power than my tek light with the same bulbs just for a comparison on how much reflectors matter

[mike31154]

Originally Posted by i have crabs

not completly true. going with a 4 bulb t5 id probably agree, 6-8 bulb fixtures have really good par. i have a par meter and have tested lots of lights and my 8 bulb tek fixture puts out better power at 27"down that most 250w halides ive tested by quite alot.

since your tank is 36" and only 21" high id say the a 6 bulb in either the tek or compact usa would allow you to keep almost anything you want, some sps probably would need to be in the upper 12" but most would be fine id think. a 4 bulb might not cut it for sps but lps and softies would be no problem.


im quite shure the compact usa lights with 4 and 6 bulbs have individual reflectors while the 8 bulb and the glo lights have 1 large relfector. you definatly want individual reflectors, imo the glo lights are junk as far as power goes thier cheep so people buy them and will defend them to the grave. i didnt even keep the 2 bulb glo light i bought on my qt tank made me crazy everytime id look at the tank
the 8 bulb compact usa with 1 reflector tested about 40% less power than my tek light with the same bulbs just for a comparison on how much reflectors matter

Yep, I'm inexperienced compared to many of the members of this board, that's why I generally offer advice only on what I've experienced so far and do my best not to regurgitate things I've read elsewhere. I have a 36" Hagen Glo T5HO fixture which I purchased when I first set up my used tank. Yes I'm cheap but it worked for me initially even if it didn't completely cover my 48" long tank. A mushroom and zoa both started growing on their own a few months after I started the tank, I did not add them, they appeared on the Live Rock on their own under the cheapo Glo. I'm currently not keeping any SPS corals, but now have a large colony of zoas and a hammer coral. I've since 'upgraded' to a 4x48" T5HO retrofit kit with individual reflectors run by two Fulham Workhorse 8 ballasts. Nothing fancy but it works for me. I still use the Glo fixture with actinics for dawn/dusk effect and am quite happy with it's performance. Did have an issue with one of the endcaps but it works fine. I would not "defend them to the grave" and I think I was quite candid in my original post in stating that the Glo fixture is "not bad". I was simply trying to provide the OP with an alternative to what he was looking at. I do not consider them as 'junk' either though. We don't all have the budget for the actively cooled high end fixtures with all the bells and whistles. Personally if I was going to go to that expense, I'd probably just fire up the used tar and coil MH goodies I have gathering dust in the basement. Not ready for SPS yet, so I'm quite content with my current set up.

[Canadian]

FWIW,

I think getting a T5 fixture without active cooling and quality individual parabolic reflectors is tantamount to using MH with flat piece of polished aluminum as a reflector. The type of lighting (T5 or MH) isn't so much important as is the quality of the reflector (and in the case of T5s of equal importance is active cooling).

If a consumer can't afford to get some of the most simple and necessary components (active cooling and good reflectors) then they would be far better served operating MH. And I'll state it again: MH is still typically the best simple option for lighting a reef tank. T5 has been proven to work superbly if appropriately implemented but doing it half-a$$ed will almost certainly lead to disappointment.

[mike31154]

Originally Posted by Canadian

FWIW,

I think getting a T5 fixture without active cooling and quality individual parabolic reflectors is tantamount to using MH with flat piece of polished aluminum as a reflector. The type of lighting (T5 or MH) isn't so much important as is the quality of the reflector (and in the case of T5s of equal importance is active cooling).

If a consumer can't afford to get some of the most simple and necessary components (active cooling and good reflectors) then they would be far better served operating MH. And I'll state it again: MH is still typically the best simple option for lighting a reef tank. T5 has been proven to work superbly if appropriately implemented but doing it half-a$$ed will almost certainly lead to disappointment.

Well, I spent all my scheckels on a VorTech pump for flow and am hoping to get another. The livestock I have is doing just fine under my half-a$$ed T5 setup so I'll just have to live with it for now.

[Canadian]

Originally Posted by mike31154

Well, I spent all my scheckels on a VorTech pump for flow and am hoping to get another. The livestock I have is doing just fine under my half-a$$ed T5 setup so I'll just have to live with it for now.

Don't take the half-a$$ed quote as being derogatory. I'm just trying to impress upon people that you can't compare a low end T5 set up to a properly cooled and reflected T5 set up and expect to get comparable results.

[mike31154]

You are correct of course. Fair enough, I think the OP will make the right decision and perhaps I'm getting a little carried away. No offense taken, and the OP is considering SPS, so he should get the best he can.

[Bartman1818]

After two days worth of research, posting, checking stores, looking at market value, pricing, etc etc.

I have decided to go with the current usa 6x39 watt nova extreme pro fixture.

It has more than enough wattage for my tank, economical, individual reflectors, dual switch, splash guard, comes with bulbs, tank mounts, cooling fans built in, etc. for 450 canadian dollars. That is the best I think I will do.

Thanks folks, didn't mean to start a heated thread

[Myka]

Originally Posted by i have crabs

not completly true. going with a 4 bulb t5 id probably agree, 6-8 bulb fixtures have really good par. i have a par meter and have tested lots of lights and my 8 bulb tek fixture puts out better power at 27"down that most 250w halides ive tested by quite alot.

You're comparing grapes to raisins. 8 bulbs x how many watts? 54w? That is 432 w (quick math I hope that's right haha). You can't compare 432w of T5 to 250w of halide! That's not a fair comparison. PLUS, you have to use the same Kelvin bulbs in order for it to be accurate. According to Steve (Stir Crazy) actinic bulbs put out a false high PAR reading as well, so if you have actinics in your 8 bulb fixture you're not getting an accurate reading.

In order to compare T5 to MH you need to make sure all the variables are equal...this is where a lot of people fail, and come up with misleading numbers which they now think is the be all end all.

[Canadian]

Originally Posted by Myka

You're comparing grapes to raisins. 8 bulbs x how many watts? 54w? That is 432 w (quick math I hope that's right haha). You can't compare 432w of T5 to 250w of halide! That's not a fair comparison. PLUS, you have to use the same Kelvin bulbs in order for it to be accurate. According to Steve (Stir Crazy) actinic bulbs put out a false high PAR reading as well, so if you have actinics in your 8 bulb fixture you're not getting an accurate reading.

In order to compare T5 to MH you need to make sure all the variables are equal...this is where a lot of people fail, and come up with misleading numbers which they now think is the be all end all.

If you're going to calculate the T5 as if it's going on a 4 foot tank (54W) then you also need to be reasonable about the application of the MH - no one is going to try to realistically light a 4 foot tank with a single 250W MH. So consider that the above example is likely 2 x 250W MH in a real-world application (although that's purely speculation on my part as I wasn't the one making the claim - but it's certainly a reasonable consideration).

Secondly, very few people actually recommend running T5HO actinic lamps. A typical application would include lamps measured some where around 450nm but generally not pure "actinic" 420nm. And as an example even a 250W AB 10,000K on an M80 ballast has its largest peak at 420nm (actinic) so I suppose it's producing false high PAR readings?

[i have crabs]

Originally Posted by Canadian

If you're going to calculate the T5 as if it's going on a 4 foot tank (54W) then you also need to be reasonable about the application of the MH - no one is going to try to realistically light a 4 foot tank with a single 250W MH. So consider that the above example is likely 2 x 250W MH in a real-world application (although that's purely speculation on my part as I wasn't the one making the claim - but it's certainly a reasonable consideration).

Secondly, very few people actually recommend running T5HO actinic lamps. A typical application would include lamps measured some where around 450nm but generally not pure "actinic" 420nm. And as an example even a 250W AB 10,000K on an M80 ballast has its largest peak at 420nm (actinic) so I suppose it's producing false high PAR readings?

ive tested a few different setups, the 4 foot tanks i tested were under 2 250w's for comparison, the tek i have tested equall to a 400w even, the 400w was a tar ballast and not so nice reflector though, personally i hate how every t5 thread goes this way every time, im just stating facts that ive tested with my own par meter for my own knowledge, if anyone wants to listen great if not fine too my corals are doing great in a 27" deep tank with the light way higher than it needs to be so in my opinion tek lights work great, i havnt yet tested any higher end 48" t5 lights that would make a fair comparison so im still a bit skeptical on how much better the light output is on them, personally i think its mostly name and features like cooling and dimming that make the over double the price