is a power glo 20 watt 18,000 kelvin light bulb good for planted aquariums?

[Anthony R]

i just bought one it seems like it helps the plants a bit you can see when the fish are on the top half of the tank it shows there colors well but when they go low it goes away is there a light that reaches that low thats good for plants and shows the colors of the fish real well i have a 30 gallon
it is 18,000 kelvin the box says so ....
this is the one i have
http://images.google.com/imgres?imgurl=http://pet.imageg.net/graphics/product_images/pPETS-3757441t400.jpg&imgrefurl=http://www.petsmart.com/product/index.jsp%3FproductId%3D2754094&usg=__lGh8tv5yOLQ1mDQigXQutB_n84A=&h=400&w=400&sz=22&hl=en&start=2&um=1&tbnid=K634FbLVVN80sM:&tbnh=124&tbnw=124&prev=/images%3Fq%3Dpower%2Bglo%26hl%3Den%26um%3D1

[pleccy]

No chance, the bulb has a kelvin rating of 18,000K, that will be emitting a fairly whitish-blue light. It will be more or less useless to plants which require something in the region of 4000-7000K for photosynthesis.