The power coming directly from the 6gal/min hydro would be too variable/dirty for any device with a transistor/mofset. So a cell phone is a no, even led/CF lighting is a no. Only the simplest of load like a super dumb motor with 'no switch/control' or a heating element, maybe if you get an old
incandescent light bulb you will be okay with lots of brown out, blackout, and over-current affecting it's lifespan.
The output is just too variable and some type of power conditioner/charge controller is going to be needed to produce a voltage/frequency that is more stable.
As to whether or not it is able to provide 5W to power a cellphone or 30W to power a light bulb. Can you state the height/pressure in addition to the flow (6gal/min) and also the efficiency of your generator setup so that we can calculate the output. Also what is the flow variability between the "Wet' season and the "dry" season.
Iterations are fine, we don't have to be perfect
My 2nd Location:Florida HardinessZone:10 AHS:10 GDD:8500 Rainfall:2in/mth winter, 8in/mth summer, Soil:Sand pH8 Flat