*[[http://www.resistorguide.com/resistor-for-led/|Calculate by hand Ballast Resistor knowing LED Forward Voltage and Current]]
*[[http://led.linear1.org/1led.wiz|LED Ballast Resistor Online Calculator]]

*[[http://www.otherpower.com/otherpower_lighting_leds.html|discussion of current limiting and votage regulation]]
*[[http://www.philipslumileds.com/support/design-resources/electrical|Luxeon Resources]]
*[[http://www.ledsupply.com/leds|LED Supply]]
**[[http://www.ledsupply.com/leds/nichia-157-led-lyra-cool-white-high-power-led|Nichia no heat sink]]
*[[http://www.ledsupply.com/content/pdf/leds-nichia-lyra-0c024_documentation.pdf|Installation directions are good particularly regarding reverse voltage, maybe need a bleed resistor]]
*[[http://www.otherpower.com/otherpower_lighting_leds.html|Some links and info.]]
*[[http://www.backwoodshome.com/articles2/thorstenson129.html| Driver discussion]]
*[[http://led.linear1.org/1led.wiz|LED Ballast Resistor Calculator]]