T-5HO bulbs

I'd go Ati Purple plus and either coral plus or blue plus.
Why'd you switch to Mh?

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Here's the specs on the Ati bulbs.... www.atinorthamerica.com/bulbs.php
Ati bulbs are heavy in the blue and purple and with Mh that's what your trying to supplement.
You really can't go wrong with any Ati bulbs imo but blue special, purple plus and true actinic are the heaviest on just blue.

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Great that everybody's throwing out suggestions before they know what color his MH Bulbs are. If he has 15 to 20k's in the fixture the suggestions above are going to make the tank real dark and real blue.

I was thinking this, but again depending on on brand of mh bulb the color is different, most bulbs 14k or lower you will want the blue supplement except maybe phoenix brand or giesemann they seem to be more blue

I don't know what 20k mH bulbs you have seen but over the years I have had almost every brand and they are the bluest blue I have ever seen 10k's  can be and usually are on the yellow side. Not a lot of people use 20k's because of how blue that they are. Maybe every fixture you have seen either had 10 or 12 k's in them.

What are your basis on stating that ATI's are the best Lamps? The best Lamps you used? The best lamps you read on the internet? Test you've run ?

And what does "Do people actually put 10k t5's in there Halides" mean? Yes people do use 10k's even 6500k's t-5's in mh fixtures. Most MH fixtures with supplemental t-5 lighting come with MH lamps in the range of 10k to 14k range, people usually change out the MH lamps to a higher blue spetrum and mix up the t-5 lamps to their liking ranging from 6700k all the way to 22K. Actinic's are measures in a different measurement and range from 03 which is actually 430nm all the way down to 480nm

On my fixtures I run 1 6700k, either a 10k or a 12k, Some sort of actinic and a Fiji pink. In my MH fixture I run basically the same combination but I may change it up a bit depending on the MH bulbs I am running and the look I am trying to achieve. Again lamp combination is very subjective as different people like different things.  

Easy there Jason I was just asking why you stated ATI's were the best period, stating that they were the best is a pretty stern statement and I wanted to see how you came to this conclusion but I see it was how nice it made your tank look. I highly doubt you tried every T-5 lamp out there as the list is pretty extensive. As for knowing nothing if you are saying that 20k's are not heavily in the blue spectrum then yes I question what you actually know when you post statements like this and that ATI makes the best Bulbs period. You should know by now when you post vague and incorrect statements on a FORUM someone is going to question you.

You make statements and don't include pertinent information Such as " As far as I'm concerned Ati makes the best t5 bulbs period." I was asking why, again pretty stern but vague statement of your opinion you made. Best built, best light output, they make my tank look pretty, What? why are they the best. Your arguing about 20k MH's not being blue but they are the deepest blue MH available, did you ask what K the MH bulbs were in the fixtures you had seen? So if you know nothing about halides why make a statement such as " I still don't think most 20k Halides are that blue" and follow up with "Then again like I already said I know nothing about Halides at all. 0 personal experience" Are you joking ? Most People run 10K to 14k Mh's and yes they supplement with blue t-5's because the 10k to 15k can be on the yellowish to white side.The majority of 20k's are deep blue and also put out less visible light making the tank dark. Yes some people do supplement 20k T-5 lighting with 20k MH's but it makes for a very blue and sometimes very dark. I want to know where you get the statistics " Most people supplement their MH's with Actinic/Blue Lamps"?? Again what K is the MH they are using?? You again are making a pretty vague statement or is this your opinion so it can't be wrong?

Now I do know people who run 6700k lamps in the morning before their MH's turn on and they run both the 20k MH's and 6700's together and then when the MH's turn off Actinic blues kick on and they run both the 6700's and the Actinic blues together and shut the 6700k's down and run only the actinic blue for a dawn to dusk effect.