Question about LED Diodes

[JNalley]

Can Diodes shift/drift in color over time/use? I bought a used pair of Prime HD's (last gen, not 16HD's), and even though they're both sync'd (One is parented to the other), one of them seems to put out more purple than the other. The lenses look similar, and I know the previous owner had them in 2 different applications (one was over a frag tank and set low, and the other was over a DT with higher settings). So I am wondering if it's a diode issue, or if I can get away with just replacing the lenses?

 

[oreo54]

Can Diodes shift/drift in color over time/use? I bought a used pair of Prime HD's (last gen, not 16HD's), and even though they're both sync'd (One is parented to the other), one of them seems to put out more purple than the other. The lenses look similar, and I know the previous owner had them in 2 different applications (one was over a frag tank and set low, and the other was over a DT with higher settings). So I am wondering if it's a diode issue, or if I can get away with just replacing the lenses?

Violets/UV has a shorter lifespan than other " colors" especially at higher output
though it is more a fade in output.

Secondly ai does seem to have a browning issue on the secondary lens over the high energy violets. The lens on the diode can also brown so both need to be looked at.

Can't rule out a dead diode at this point either.
By turning on each channel by itself you should be able to isolate which one may have an issue.

Careful though since even dull uv/ violets can hurt ones eyes if you directly look at them.

Since these are used and no idea of how old any issue beyond replacing the secondary lens may not worth repairing and just need to be worked around with channel balancing.

Could be a driver issue but less likely.

 

[JNalley]

Violets/UV has a shorter lifespan than other " colors" especially at higher output
though it is more a fade in output.

Secondly ai does seem to have a browning issue on the secondary lens over the high energy violets. The lens on the diode can also brown so both need to be looked at.

Can't rule out a dead diode at this point either.
By turning on each channel by itself you should be able to isolate which one may have an issue.

Careful though since even dull uv/ violets can hurt ones eyes if you directly look at them.

Since these are used and no idea of how old any issue beyond replacing the secondary lens may not worth repairing and just need to be worked around with channel balancing.

Could be a driver issue but less likely.

Thanks for the reply, I'll try to dismantle them this weekend and see what I can figure out, the secondary lens (the one visible without dismantling) looks very similar on both lights, one might have a slight yellowing on a couple of the diodes but that could just be my eyes playing tricks on me too. I'll try and take them off and hold them up to white light to confirm. I really hope it is just that because I'd rather not buy new lights. I bought them used because I specifically like the storm functionality (Which was removed from the 16HD's and is not present on many lights anymore these days), none of my fish freak out over it, and having lived in tropical places most of my life, storms are fairly common, and the way I have them set up they're truly randomized and mimic nature...