I use the Giesemannn Aquaflora
as well. It is one of many "pink" bulbs that have the spectrum that plants need and they also bring out the red colors. Avoid bulbs that have a blue cast including a 10,000K bulb. They will make your red plants not "pop" and look dull. Zoo Med has the Flora Sun
that has a pink cask and it is somewhat inexpensive. Current USA has a Freshwater
bulb that is pinkish too. Other pinkish bulbs are Aquatic Life's Roseate
bulbs, Coralife's Colormax
(make sure that you get the HO version, they also have a NO version too), True Lumen's Freshwater Flora
I purchased several of the Giesemann Aquaflora bulbs, but I bought Zoo Med's Flora Sun for replacements because they are about half of the price of the Giesemann's.