Phoenix 14k vs Giesemann 14.5k vs others...

[Ricimer]

Hi!
I would like to have your opinions, suggestions, experiences about DE bulbs in the 14-20k spectrum. I am currently using a 48" Giesemann lighting system (DE with Icecaps electronic ballasts) with two 250W Phoenix 14k, one daylight T5 (around 6500k) and one pure actinic T5.

I started with the default 13k Giesemann with 2 actinic plus. I then switched to the Phoenix DE bulbs and witnessed a significant improvement in blue, purple, and green coloration of corals. Bright pink coloration on the Pocillopora and Stylophora decreased at the same time tough. Those colors got back when I changed the T5 to the current set-up. I think the 6500k T5 is responsable for that. It also brings a nice balance to the ambiance/color of the lighting. I miss the blue dawn from the actinics tough. The pure actinic T5 is eclipsed by the daylight T5 and is almost unnoticeable (they can't be turned on separately...).

Anybody experienced both the Giesemann 14.5k and the Phoenix 14k and can give me a comparison? What about the Giesemann 20k? I would like to try something new in that range (14-20k) when I get to change my DE.

Many thanks!
Ricimer