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natural light intensity

I'll try my question again. Didn't get much response last time.

How feasible is it to use natural light (no sunlight) to light an
aquatic plant tank? I have a hunch that its important to get about a
half an hour to an hour of sunlight.

Can anyone help me correlate the lux intensity of tropical daylight (no
direct sunshine) with the typical lux intensity we desire in planted
aquaria? We'd be looking at a percentage of the arc of blue sky.

Also, how much does this light intensity vary according to a cloudy day
and a rainy, overcast day?

The place we're interested in is Cebu City in the Philippines. The idea
is to see how feasible it is to use ambient lighting since the cost of
electricity is relatively high and sunshine is virtually free.

How about the idea of placing the tank where it would get shaded
sunlight for a period of half an hour or more? I read stories in TAG
about early aquatic plant pioneers favouring east facing windows. I
expect it was even more of a trial and error process for them than for
us today! ;-)