Aqualine Buschke makes a 5000k bulb that has a higher amount of red in it to highlight red plants in planted tanks. No, I have not tried it yet but will soon. Can be found for about $55 + shipping. I used a fishneedit 8000k bulb and hated it. too much white almost blue. Probably good if you have green only plants. I went back to 6700k for now.