I prefer T5's because of the low heat, multitude of bulb colors, and being able to change the color with a simple bulb change. What are the dimensions on your tank? The only time I'd use MH's is on a deeper tank (30" or more), but that's just my opinion. MH are great, I just prefer T5's.
Check out Giesemann Lights, they're expensive but top of the line.
I run LEDs with my halides. Right now I use Phoenix bulbs, they are bright and quite blue....but not sickening blue. Not sure on the Elos, it is a new bulb. Giesemann makes sa 17.5 k bulb that is also new, but far from being 17.5k, more like 12k.
I have tried LED, halides and T5. I prefer the halides by far for their brighter, even color and great shimmer.
Very white, with a little bit of a purple accent on it. Good looking bulb. IMO not super bright.
The Giessemann 17.5k Crystal bulbs are supposed to be Icy White with a touch of blue?
For blue, I'd go with a Phoenix or Radium. I currently run both bulbs on my 100g. You can go for a Ushio 20k or XM 20k, but growth will probably suffer.
If I could go all T5 - I would go ATI fixture. It's proven to be better. 6 or 8 bulb fixture. 8 if you have the room.
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