how long do i leave it on?

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Japonicus

Feeder Fish
MFK Member
Oct 11, 2008
137
1
0
sydney, australia
i recently purchased a small amazon sword plant with a couple of broken and dying leaves.

i got it for quite cheap since it was damaged. the plant is on a piece of driftwood and not in the soil. i have read that plants on driftwood reply completely on the lighting they get and none from the roots and that the roots are only a support.

so my question is, how long do i have to leave a 40watt light on a day for my plant to have sufficient photosynthesis. my mum is tight with he electricity. really really tight.

thanks for reading
 
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