interesting test. About what I would have expected given the results for automotive parts with about the same results (aka, powder coating doesn’t have a large effect on temperature transfer. Now ceramic coating on the other hand is a whole other ballgame).
I have to say, that yallow light is really not bad, I could see several uses for it.
Captured on film for the first time ever, the dreaded Li-ion Tape Worm. This illusive creature has been the bane of electronics consumers the world over.
On a serious note, Thank you djozz for yet another hobby changing, well designed test and report.
Thanks for the test.
Djozz busting myths, I like that.
Next we need, disproved theory that solder alloy thermal conductivity rating as being critical for better LED cooling in DTP MCPCBs
Current plays a huge role in lifetime, see CREE’s results.
Those L70 ratings are rather pointless at low currents.
Reaching L90 at higher current is way faster even if case temp is way lower.
Just compare the last 2, huge difference for L90, despite the way much lower case temp.
Glad to see this thread vindicating James and his attempt to fill a niche market with custom finish lights…
I was watching the other thread closely as I thought the powder-coated light looked really good. I was disappointed to see that thread get turned into such a flame war.
I’m also sad to see that nice fluorescent yellow light hacked up, but at least we know it was…
The Fluorescent Yellow C8 price after code is £25.85 + Shipping
The Fluorescent Yellow S2+ price after code is £24.75 + Shipping
A bit higher than original mainly due to the current exchange rates! etc.
I currently have NO spare hosts in stock (but there are more on the way)
Depending on how many orders there are I will order more hosts tomorrow. So please see this as a pre-order!
e.g If i get 10 orders tonight I will order 15 more hosts tomorrow
They will be done ASAP after I get the hosts
This way it saves me from doing an interest list and waiting for it to fill up, then ordering the hosts, then coating them.
I will do it as and when people order. It should cut down the wait time
I’m not going to set an end date for the coupon, but it will end so if you want one get it before the price goes back up!
Do you know the LED case temperature of a XML2 when the body is 70dC with an aluminum star at 2.7A?
There are reports from self desoldered LEDs in FET lights that do at best 5A with lead free solder which has over 200dC melting point
I would estimate that the LED case temperature of the XML2 can reach easily above 150 dC when left unattended at 2.8A in a stock light
As long as the only problem with them is the waterproofing, then awesome, they’re battle-scarred champions with history behind them. If you’re not too attached to them anymore, I’m sure they’d be a real object of desire and a guaranteed sell on a WTS thread :innocent:
Fwiw the 1.14A S2+ triple I just finished needed no time out. It got hot but never too hot to hold. I suspect that 4 chips or more minutes might need it if left free standing while hand held might be stable though hot.