I just finished installing a bunch of LED lighting in my home which run off of my 12V PV system. I have been experimenting with different types of white LED indoor lighting for over the past 5 years and have tried many different types of LED's. These Lights that I have made are based on the Luxeon line of 1 watt power LED's. They do not produce the blueish light like you may have seen in other LED lights or flashlights. Each light block is made up of 3 Luxeon LED's on a black heat sink. Each light block is tuned for roughly 400ma when ran of a 12V source and 1.5 ohms of wire resistance. They can be ran up to as high as 500ma but may get quite warm. They are more efficient at lower drive currents which makes then scale down nicely. I can set the whole house to a low power nite light mode and still be able to see when I get up in the middle of the night while only drawing 1 watt for the entire house. In the past I have used a series of switches to switch in different resistors to change the light intensity. That worked well for many years but I am now using a more sophisticated PWM controller to vary the duty cycle of the lights in order to dim them. If you are interested in a PWM driver I can see about putting a few more of them together. See links for pictures of my setup.
http://members.cox.net/brlux/CPF/Led%20home%20lighting/Home%20lighting%20new%203.JPG
http://members.cox.net/brlux/CPF/Led%20home%20lighting/Home%20Lighting%20new%202.JPG
http://members.cox.net/brlux/CPF/Led%20home%20lighting/Home%20Lighting%20new%201.JPG
I have parts and supplies left over to make several dozen more light blocks. So I thought I would see if anyone here would be interested. I would like to get $30 a piece or 4 light blocks for $100. I am not sure what shipping will be so I will say $5 flat shipping within the continental US.
Contact bryson79 at yahoo . com
