From what I have read and experienced - the ATI line of bulbs are great value. The Blue plus is a great bulb for the price and very popular. The have the Purple plus which is basically a 20 dollar version of the 34 dollar KZ Fiji purple.
If you had a 6 bulbs -You could do worse then 2 ATI blue plus, 2 ATI blue special and a ATI Purple Plus / ATI True Actinic 03 bulb.
Do some searches - "best 4 or 6 bulb T5 combination" and you'll find a plethora of other opinions.
Hope this helps. These bulbs can be had $18-20 from BRS during a group buy. Which we have one coming up in Early May.
I second the ATI blue+, they are great bulbs, give really nice coloration. And if your lighting system allows just some bulbs on in addition to all on, just having blue on produces a beautiful effect.
These are the ones I bought/hate. Not really hate....I just don't like them as much as the blues. I used them for 3 nights and then took them out. I will be doing a LED now anyways. So basically I spent $100+ and will not be using them.
ATI 48 Inch 54W True Actinic 03 T5HO Fluorescent Bulb
I have 2 400w 10k MH and 4 T5's. After reading the comments on the ATI bulbs, I just switched out the Hamilton Actinics I had to 4 blue plus bulbs. Love the look, colors really seem better. In fact with the brighter bulbs I now enjoy the tank with just the T5's on.
+1 on the ATI bulbs, Blue +, AquaBlue Special, Purple Plus, all great ATI bulbs. Very nice PAR and great spectrum. I had them on my 5-bulb and 4-bulb fixtures when I ran T5's and loved them all.
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