Regarding our dimmable LED-light bars:
They have blue and white LEDs for moonlight (great effect in combination with the moon phase program of ProfiLux), red LEDs to simulate sunset (the light is more red at morning and evening) and white high-power LEDs to create flashes. The LED-groups can be dimmed independently.
The length is about 60cm, diameter is 20mm. They have only a small wattage (2.5W) because they are only designed for effect-lighting and not for replacement of the MH or fluorescents.
One bar is usually ok to illuminate a tank of about 1.5m, for longer tanks i recommend to use more of them.
I don't want to tell some pseudo-scientific arguments for this light (as maybe some other manufacturers do for their products). I am not sure if there are confirmable benefits for the fishes or corals, but it just looks really good. Maybe someone will now complain that thunderstroms my drive the fishes crazy - but in nature they have them also.
Dimmable sockets
They can be used to supply dimmable devices (eg some pumps, heater, conventional lamps) with a variable voltage. Coming soon.
Giesemann
I don't know this lamp but they usually don't equip non dimmable lamps with dimmable ballasts. That means: The ballast must be replaced in the case you want dimm the fluorescents.
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