What could make a SSC P4 suddenly shift color?

Had a brilliant white USWOH suddenly turn yellowish with a slight tinge of green and output is diminished.

Overdriven and/or very poor heatsinking are definite possibilities.

Any way the emitter could have been damaged?

I think if it were overdriven it would be angry blue, what you are describing sounds more like under driven. Perhaps a board, battery or conductivity changed?

holeymoley said:

https://www.candlepowerforums.com/threads/175841

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This emitter is only 3 months old! Surely, it wouldn't go bad that quickly!

3 months from date of manufacture, or 3 months from purchase?

This happened a lot with the Amilite T5 soon after it first came out. The light was designed to take 3V primaries, but of course people just had to go and put R123s into them (3.7V nom, 4.2V fresh off the charger) despite being advised not to do that. The emitters were overdriven, turned yellow, then brown, then burned out completely.

I'm not saying that you have necessarily overdriven yours - it could just be a bad one. But the emitter has failed for some reason and needs to be replaced. Look on the positive side - it's an opportunity for you to upgrade to a more powerful bin!

All that has been in it were 3.0 volts lithium and rechargeables. I think I have a bum one. The emitter was made in May 07 and the light has been used very little. I ain't buying the tin plated crap. If that were the case then there would be a huge recall. That would be a major issue.

Please be more specific. Which light are you using the SSC P4 in? What kind of circuit does the light have? Does the led have good heat sinking? What current(s) does the led run at? Is it a mod?

Bill

Heat heat heat heat................another led bites the dust.
Well it's time to break out the soldering iron and upgrade!

whippoorwill said:

All that has been in it were 3.0 volts lithium and rechargeables. I think I have a bum one. The emitter was made in May 07 and the light has been used very little. I ain't buying the tin plated crap. If that were the case then there would be a huge recall. That would be a major issue.

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Yes, you should be a bit more specific. 3.0 volt primary lithium cells.... and what voltage rechargeables? What light is this in?

The SSC P4 Emitter ... have you checked if the base slug ( +ve ) is shorted to the body ???

Sgt. LED said:

Heat heat heat heat................another led bites the dust.
Well it's time to break out the soldering iron and upgrade!

Click to expand...

:thumbsup:

You will have the opportunity to ensure good contact with the heatsink at this time (while ensuring the slug is not making contact). This will allow the LED to enjoy a nice long life of service in your light.