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For regular 120vac spin in bulb sockets I found the philips LED's at home depot to do well with dimmers and so far not one has failed in over a year. Can't say the same for the 9 watt bulbs I got from dealextreme a while before that. Most of those are dead. So much for thousands of hours bulb life. You get what you pay for. I have lots of LED strip lighting in my living/dining room above beams. They aren't bad but not crazy bright. Can choose a myriad of rgb colours. Try to find twin packs of the philips led bulbs, best $ savings.
The cheap LED bulbs either have inadequate LED driver circuitry (that fries) or they over-drive lesser watt LED's and the LED's fry.
The previous comment has the same info I have re tech for low head
and as stated you do need some head, When you say bog I think that something is making the water back up creating the bog (still water. This could be some sort of dam, natural or otherwise. Perhaps there is head beyond the "dam" which is a close enough source
to where the power is needed. My understanding is that only 3 feet of head is necessary to use a turgo downdraft turbine as in the link from the previous comment. Good luck.
Surprisingly, HID still offers more efficiency per watt. If you already have a 12v battery bank. Try any number of cheapo HID kits available on ebay. Can be found for under $35 for two ballasts and two bulbs. Get the 4000-5000k colour bulbs. 35w HID is VERY bright. With my K1200LT BMW I can now actually see stuff at night! Anyhow, experiment with sticking an HID bulb into a big glass globe type fixture, I'm sure 3000 lumens will be plenty bright. Take a look at LED vs HID further down this page: http://www.hid-lightsdownunder.com/... 35w HID takes 39w of LED to equal.
The elevation (head) gained by going further upstream is negligible compared to the head I attain by going to top of bank.
so I'm looking for a non-electrical mechanical advantaqe to get to top of bank. So is there a Fife Ram large enough to keep a large tank full to satisfy the turbine requirements? It may not work or be known. I think getting a GPS reading for elevation from intake locations may be interesting. If I could run a pipe up the creek to feed the tank it may work?
I, in fact, have a 10 ft. water fall 100 ft from my home.
According to the calculations I have done with assistance of a mechanical engineer it has been determined I could get about .85kw
theoretical from that fall.
At top of bank I have 28 ft of head which could produce 1.9 kw. So my dilemna is getting water up to the bank in an efficient manner. Ideally, I could put an intake into the creek and gravity feed it to a tank (in-ground) to feed a turbine below.
However, as you pointed out unless that works using an electric water pump (which is already in place from previous irrigation use) to do the tank filling is a losing proposition. Would it be possible to use a Fyfe ram to fill the tank? Would it pump fast enough to feed the turbine's needs? I have always thought a cross flow turbine would be best, however I am open to suggestions. The flow rate is 300 gpm in a 4" pipe which would be reduced down to about 1.7" depending on turbine. Any thoughts?