It's taken rather a long time to arrive and unfortunately isn't actually blue, it's white. The zip top bag it's in has the right Sku on it.
Looking at the picture and then at the LED I have, they look identical. I had a thought though, should a blue LED have yellow phosphor over it's die? I kind of think not, so it should look white rathert than yellow.
Anyone know? This is more out of curiosity than anything else, I've sent an email to MF hopefully they will be able to sort it out.
Yeah that's what I though, which means the LED in the photo as MF is also white. So either they used a stock photo or they don't actually have Blue LED's.
For whatever reason especially cool white leds are sometime called "blue." At least, by my idiot friends. DX has a blue Cree XR-C, and you can get blue XP-E from Digikey (unmounted) or Rapid Led (mounted) in blue and royal blue if you are still looking.
It's depends a bit what you are talking about, the predominating colour or the tint. We also call a led " blue", when we mean the secondary colour. Many old Cree XR-E white LED have a blue tint... read some kind of blue-ish white.
I've picked up some blue Rebels of eBay at a bargain price, so those will have to do as this is a project for someone else and there is a bit of a time limit on it.
It was nice to see MF's reaction to my report, they have pulled the item from their site untill they test them.
Personally, I wouldn't liken the wavelength of an led to the color temperature, but ok. I can understand a white led having a blue-ish tint but that doesn't make it a blue led.