question for Lumia 5.1 users

[d0ughb0y]

question for people who built a diy LED using lumia 5.1. Does channel 5 violet LEDs not glow when you apply power to it?

on the lumia 5.1 I got, the blues will light up, but not the violets. Are the violets not visible UV light? I'm assuming since the LEDS are in series, that there is no open circuit on channel 5 as the blue LEDs do light up. I think 410nm should still be visible violet light right? I just want to get confirmation from other users that this is normal and I don't have a bad lumia 5.1 chip. (the chip I got is not from the US seller).

tnx.

 

[Theokie]

I have been running a lumina 5.1 for over a year now, and found that there is a leakage, for lack of a better term, between the channels. This manifested after about 6 months of use, basically its a blue and white with a bit of UV, since its not the primary light on my frag tank I haven't disassembled it to do further diagnostic. It appears to me that the 5.2 version is significantly better designed with better insulation between the channels

 

[d0ughb0y]

did you try turning on channel 5 only, say at 20% and see if the 5 blue leds and the 5 violet leds all glow? on mine, I do see the blues glow but only a very faint glow on the 5 violets.

did you connect the negative line of all 5 channels together or did you wire each pair of +v and -v to each meanwell ldd output separately? The 5 channels are all on separate circuit. By leak do you mean a channel that is not powered is turning on if you turn on power to an adjacent channel? The meanwell ldd vin and vout ground are also not connected together so it appears all 5 channels circuit are isolated from each other.

 

[oreo57]

did you try turning on channel 5 only, say at 20% and see if the 5 blue leds and the 5 violet leds all glow? on mine, I do see the blues glow but only a very faint glow on the 5 violets.

tough one.. Depending on the wavelength and your own eyesight it could well be that most output is beyond "visible" for you..
Checking the current on the violet circuit might be somewhat diagnostic.. If it is drawing the correct current it "should" be emitting the correct amount of light. Then again violets have always been problematic as to lifespan..

 

[perkint]

Will a CCD (ie digital camera) see UV? I know they'll pick up further the other way than we can see (try pointing an infrared control at a phone camera). Might be worth a try to see if they are working.

410nm is getting close to true UV, but it should still be visible. As Oreo57 says tho, people's eyesight does differ.

Tim

 

[perkint]

Actually, just tried it with a 'UV' light, which isn't quite true UV, but not far off (never actually checked it for wavelength, but is very dim to the naked eye, but causes bright fluorescence) and the phone camera picks that up much better than my eyesight does.

Tim

 

[oreo57]

Will a CCD (ie digital camera) see UV? I know they'll pick up further the other way than we can see (try pointing an infrared control at a phone camera). Might be worth a try to see if they are working.

410nm is getting close to true UV, but it should still be visible. As Oreo57 says tho, people's eyesight does differ.

Tim

UV should be cut in most good camera sensors..

IR is more problematic.. ask Sony when they accidentally made peek a boo digital cameras..

Of course 660nm red would also be dim..
http://www.lpi.usra.edu/education/fieldtrips/2005/activities/ir_spectrum/
A bit more accurate

 

[perkint]

I remember the sony camcorders that could see thru some clothes in night mode

Tim