That might depend on the kinds of plants you have. I had this bulb on an aquarium moderately planted with anubias and java fern, both of which have low light needs. They grew very well. I soon had algae too, but that might have been because I accidentally left the light on too long for a couple of days (timers are highly recommended). On my 5.5 gallon aquarium, the light was brighter than I liked. It actually created glare on my light-medium brown gravel, which I found unpleasant.

The ballast wouldn't do that- it is designed to limit the current through the bulb since these type bulbs cannot self limit like an incandescent bulb does. Compare the actual color spectrum the bulbs produce. This information should be on the box- if it's not then you may have to contact the manufacturer. The relative strength of the colors in the light cannot be accurately seen by looking at the bulb light itself- it shows up in the objects that are illuminated.

Thank you for your question. Here is a link to all the full spectrum bulbs we offer: http://pet-supplies.drsfostersmith.com/search?p=Q&lbc=drsfostersmith&uid=974874346&ts=custom&w=18%22 full spectrum&isort=score&method=and&view=grid&af=cat1:fish type:product&visitorID=Jake&cartcount=0&wishcount=0&division=dogs&cartcount=0

This is the correct style bulb, but you will need an 18" version. 18" T5 replacement lamp. Just be careful not to get one that says "HO" as this would require a different fixture to power it.

10k is a little bluer than 8k. This is different than its ability to accurately render colors. The rated CRI (color rendering index) gives an approximation of that quality.

Thank you for your question. We have attached a link below which contains a 24" 20w Full spectrum T8 bulb: http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=12763

It is not a "daylight" bulb according to the importer. I'm disappointed in the color compared to my true "daylight" bulb. Colors in my other 3 tanks w/full spectrum lights are muted compared to my "daylight" bulb.