You know Dan, I have read this thread and skimmed the others you linked to, and I would once again like to express my thanks to you for spending the time and energy to try and educate car hobbyists about automotive lighting and to protect them from shoddy and dangerous products. You bring clear technical analysis and a wealth of knowledge and information to the debates and evaluation of lighting products. You catch a great deal of crap from many people for giving brusque and sometimes biting commentary, but such comments are really not deserved. Your comments shine the cold light of logic and science through the murk of profiteering and the haze of advertising. Critiques like yours are necessary and invaluable, and you do it all for free. And you keep doing it after getting repeatedly insulted.

I salute your dedication to helping other and the depth of your knowledge. You really are a great resource and we should all be very happy you take the time to save us from making horrible mistakes that have a strong possibility of killing us. Thank you.

WHOAH. Wrong way to do it, bigtime.
Yeah, you do, you just don't realize it. It sounds like you care at least a little, which puts you head and shoulders above the goofs who think their car's lights are toys rather than life safety equipment.

"Visibility" means way, way more than just "Do they light up real bright?". It is not impossible to make your own LED car lights and come up with something adequately safe for use in public-roadway traffic, but it is a great deal more difficult than most people realize. See threads here and here for two examples of homemade LED light projects with the right amount of thought, effort, understanding, and technique behind them to be probably safe. Seriously, everyone reading this thread ought to go read those threads. Even if you don't care a whit for the technical stuff, the amount of craftsmanship that went into the mods is a beautiful thing to see.