FlameTetra333 - The lumens output of a light has little to do with the light needed to grow plants. This website can explain it far better that I could:
Bulbs
Your ballast will determine what watts of light you can produce with your current hood. This should be stamped on the hood somewhere, something that says 'Maximum watts' or 'Use bulb no more than XX watts'.
'Stock hoods' (those that come with a basic fish aquarium set-up) usually do not have the ability to produce enough light for plants needing 'high light.' If you want to produce 40+ watts in a 24" hood, I'd recommend you do a retrofit and convert to a compact fluorescent bulb instead of a straight bulb.
This website shows just about every lightbulb you can think of. I've been buying bulbs from them for years. Below is a link to their page for those bulbs used in aquarium hoods:
Aquarium Lights: Light Bulbs Etc, Inc.
Thanks OC, however, i don't want to spend any more money on lighting. The reason why I wanted high light is because I wanted to grow dwarf baby tears. However, since I cannot find the appropriate bulb for them, I just want to keep them alive. So, with low lighting, no CO2 ( I tried to make a DIY geberator but yeast spilled into the 20G, tha
36 or 55 watt Bright Kits
Sorry, OC, but I do not know what "retrofitting" is as I am a child. Also, the only reason I wanted high lighting on my 20G was to grow dwarf baby tears, but since I looked all over the internet, I've decided to give up on that.
So, can dwarf baby tears survive (not necessarily carpet, but at least grow taller), if I do regular doses of Seachem Flourish, and the lighting I have right now (Zoo Med Ultra Sun Super Daylight 6500K 17 watt bulb)?
Also, just out of curiosity, since I could not find neither a hood nor bulb that is 30" (hood) or 24" (light) that goes above 20 watts, does that mean watts do not necessarily determine what is "high light" or "low light"? Sort of like the rule "one inch of adult fish per gallon of water", meaning it's just a general guideline for stocking, or in my case, growing plants?
Thanks for your help!