The solar cell is inside the canopy, with me PC lighting using a 50/50 bulb the scc3776 solar cell is putting out 7.8 volts and 42mA which durring a 12-14 hour period of light, is enough to charge the 6volt NiCd batteries to run for the 6-10 hours at night without any problems. I use these same solar cells in my photovoltaic robots and the work wonderfully. The only problem I am having is using the NiCd batteries i may need to change to a more effecient rechargable, or i may use a large capacitor disharged through a resistor as the "battery" itll give the moonlight a nice fade as the power tapers off. the LEDs are on the 460 nM wave length. But i am olso adding a feature where the light can be plugged in which would eliminate the solar and battery set up. Even with an expensive reflector the light saturation caps out at about 85% so why not use the other 15% or so of power loss to run your moon lights? LEDs take such a small amount of current to run vs their light output its very hard to beat their effeciency. Even if the solar cell was only able to partialy charge the batteries that would account for more than enough "juice" needed to run 4 LEDs.
I completed the test circuit last night its charging as we speak ill test the batteries when i get home tonight to see what kind of charge they recvd. To make it a fair test i drained teh NiCds to almost empty. So we'll see.