I'm surprised they look the same.
The above is the "aquablue plus"..
Like this one..
T5 TL 24 watt - Aquablue + Giesemann - blue-white 15,000K / 5 band phosphor tube T5 TL - Aquablue + Giesemann - blue-white 15,000K / 5 band phosphor tube. D
reef-aquarium-store.com
NOW what does ATI say about the Coral plus?
Our T5 bulbs were first introduced to the market in 2000, so they have a long track record of success. T5 bulbs combine the latest advances in both phosphor and manufacturing techniques to produce bulbs that are stable and with better coloration and higher output. These bulbs are trusted and...
atinorthamerica.com
Now a 150,000+K bulb should not "technically" look like a 15000k bulb..
Our T5 bulbs were first introduced to the market in 2000, so they have a long track record of success. T5 bulbs combine the latest advances in both phosphor and manufacturing techniques to produce bulbs that are stable and with better coloration and higher output. These bulbs are trusted and...
atinorthamerica.com
Not saying you are wrong and yea the 2 are sort of equivalent but the Geisseman should be more err "white" to some people.
BTW, I'm not using "white" as a bad thing..
In a mix it might be hard to tell the difference.
Or where there is nothing to highlight the difference.
I agree the price is right and Geisseman makes great bulbs.
Another comparison.
G on left ATI on right..Note the tone is about the same visually..to us.
Yea I'm splitting hairs..