Truth is I still have none to light up my desk. I rely for now on my good old 22" CRT monitor to make my keyboard visible. But The Idea of having my own LED lamp!
You are right, a 9V driver is a waste of power. But 12V out from a 11.8V battery isn't easy. One would need a Buck-boost converter to overcome this. And here's how a simple lamp becomes rocket science.
Claude[ Parent ]
I only need about 9.1V for "full brightness". That's 96 chips at about 4.5ma each. Pretty efficient. :-)
I don't want to run the battery lower than about 12.2V anyway, hence the grid-assist.
Maybe someday you will have Enough LEDs to build that lamp without so much worry? Build the lamp already!
Me + Buck + Boost = Smoke G-[ Parent ]
The newer Lexon II , III and K2 have some impressive lumens now. They're still within the 3.3Vdc range and even the newest one will hold a steady 3.6V 350ma with bliding light output. With I'd say, a 20 degree beam, that green one I took a picture of will put a light on my ceiling 12 feet up and when using a defusser will cast a nice glow on my office. Digital camera seems to have problems with some of the different light colors but I can certainly try taking more if you wish.
50Ah of NiCd? that's it, do I need to ship more;_)?
I agree with the fact that the bigger, or more intergrated, you put on the RE the better the numbers look, but what fun is that?
Are you looking to use a dump controller in reverse to keep the LEDs lit?
Cheers Bruce S[ Parent ]
