I think this site is having a sale or something, I just ordered some of the 1w leds (Luxeon I's) for 6.25 each and now they're around 3 bucks. The luxeon III's are even around $3-4 as well (usually $8 each).
That would be a blinding binary clock.
I have been considering the idea of mounting several of them to my ceiling fan and run them like a propeller clock. Although they would probably make a better color organ. Getting power to them would be the only problem really.
Lumileds' sever works fine now. Before it was taking a snooze.
They have a very confusing product line-up. A Lumiled-V isn't 5W, a Lumiled-III isn't 3W.
Lumileds' sever works fine now. Before it was taking a snooze.
They have a very confusing product line-up. A Lumiled-V isn't 5W, a Lumiled-III isn't 3W.
if you check out the specs on the red, r-o and yellow star III, they are actually 4+ watt leds (Vf 2.95v If 1.4a)
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as I understand it, lumileds is dumping their current luxeon stock to make room for the next generation (mar '06) - most of the star iii's are sold out already, lots of star i's left, at least in their US warehouses.
as crappy as Future's website is ... their fullfilment service is darn fast.
I placed my order last night around quarter to nine (est), and a few hours ago, fedex delievered them ... andno I didn't pay for overnight shipping
pictures coming shortly ... I am pleasently supprised by the size of these units ... sure reading the measurements in the datasheet is one thing, but seeing them up close is another!
I'd mentioned this in numerous other threads, I know it hasn't been asked yet but I figure it's worth hitting right off the bat.
Powering low voltage, high current devices with a well regulated current is fairly difficult. A current mode PWM like the HV9910 is really cheap and works very well provided you have enough source voltage. Perfect regulation and there's no heat.
I agree, the 9910 is awesome ... goodbye lm317t, hello hv9910
only problem I have with the 9910 is getting the super low resistances needed for the current sense ... what I think I'll end up doing is program the current sense for some high value, and then 'trim' the output using a multi-turn pot and the LD pin?