Actually, my plants grow bigger, faster, more colorful, and rarely get mold or fungus when I use higher powered. Each of my 10 gallon terrariums have humidity of 85-90%, nothing to circulate the air, and all of my plants grow extremely well under my growlight, which produces about 9,000 lumens. I have found out the hard way that the more light you use to grow your cp, the smaller the chance is of them getting fungus, or mold. The lower the light levels, the higher the chance of fungus or mold attacking them. The more light they get, the higher their "immune" systems are. Also, lower light levels will result in etiolation,which is where the plant or plants start growing on a tall,weak stem to reach the source of light. The light you posted a link for will work well for a 10g terrarium.
dewy