I have no personal experience, and searching online has had limited success. Here is a blurb from one supplier: Philips Aquarelle Tubes
These lamps create a natural light, with a colour temperature of 10000 Kelvin. There are four phosphors, giving a broad spectrum of colours blue/green, red, yellow and strong blue. This makes it a great light for tropical and Goldfish
, offering outstanding colour rendering. Aquarelle encourages oxygen production, which in turn creates excellent conditions for growth.
I would like to see the spectrum graph, but if the tube is strong in the blue, red and green/yellow it should be OK as far as spectrum. The somewhat more important thing is intensity, and nothing is given on that; but two tubes over a 180 liter (=50 gallon) tank should work, assuming these are T8. Last, the colour hue at 10000K would indicate a very cool white, high in the blue and minimal in the warmer red tones. Sometimes these can be good, sometimes they turn the tank purplish and do not produce a true colour rendition. I have had good results combining one 10000K with a 6700K over a tank.
If this is a used setup, the age of the tubes would be important. All fluorescents diminish in intensity as they burn, some faster than others. Replacing tubes every 6-18 months is necessary, depending on the tube. I tend to replace mine every 12 months and that seems to work with T8 tubes. When you replace, you should be able to track down "better" tubes, look for a 6000K to 7000K rating, in full spectrum or daylight types.