Παραθετω αποσπασματα:
"In a low light tank this means 0.5 to 2 watts per gallon of normal output fluorescent lighting and high light is from 3 watts per gallon and up"
(http://www.aquariaplants.com/lighting.htm)
"On average most plants will do just fine under 2 watts per gallon however plants such as java moss and java fern will do fine in 1-1.5 watts/gallon. For a really succesful tank 3-4 watts/gallon is needed"
(http://www.plantedtank.net/articles/...anted-Tank/14/)
"Low light is considered to be a minimum of 1.5 to 2 watts per gallon of water, while bright light levels are 3 or more watts per gallon of water. Moderate is somewhere in between two and three. Shallow tanks such as a ten gallon can get by with less. Stem or "bunch" plants which are cuttings, require a bright light in order to take root and grow"
(
http://www.aquabotanic.com/litg.htm)
Επισης μια αναγνωση εδω σου δινει την εντυπωση οτι αν εισαι κατω απο 1w/l δεν μπορεις να κανεις πολλα πραγματα: http://www.thekrib.com/Plants/Tech/Lighting/
Εδω για το γλωσσοστιγμα: http://www.thekrib.com/Plants/Plants/glossostigma.html