LED lights, are they still more vulnerable to failure while turning them on?

[lucca brassi]

Led's have two weak point :

1.to high current ( depends physical and material properties of of LED ( dynamic resistance / forward voltage )

2. weak thermal transfer (if led is cooled properly and driven OK , then much higher current can be tolerated )

Switch must be proper designed (mechanic or electric and both would work fine ) ,

More safe are these without physical contact (less sealing ) with water ( magnet ( hall , red ) , piezo -.......

of course led have much longer life , much greater efficiency and lower electrical consumption what means battery last longer...
-----------------------------------------------------------------------------------------------------------------------------------------

PS: mentioned incandescent bulb lamps

Funny is that the halogen lamp can be switched on and secure with a higher power.... but some people who don't understand physics are simply

ignored that fact . Answer is ''soft start'' known from starting HiFi amplifiers , till starting high power electromotor's. Most killing start for

incandescent bulb is instant switching ( with twist head or toggle switch ) where temperature starts from ''room temperature '' to almost two

thousand degrees which bring enorme stress in material in hundredths of a second .

Funny also that physically they are properly made ​​Halogen almost immortal, but they are artificially made ​​so as to have known life

The Lightbulb Conspiracies | Greenwashing Lamps which later grow on all other products

 

[leona912]

From what I know that the quality LED lights are instantly on, and with no heat actually. So I think now the quality one should not have some problems when turned on. I am not familiar with LED technology, I just learned from a LED basic blog here Led Basics, hope that can be helpful.
My first post here after I read this thread, correct me if I am wrong.

 

[lucca brassi]

Well not true led is in basic big semiconductor junction same as processor in computer and both have same problems - overheating (roughly speaking )

one of the most selled led inside scuba lights is cree XM-L from company original brochure 4 of them can easy get temp of 132°C (look on IR scans ) and that in basic means lamp like that



http://www.cree.com/~/media/Files/C... Application Notes/XLampThermalManagement.pdf

for some more easy stuff some videos SinkPAD - LED Thermal Management experts | LED Cooling | LED Manufacture | Cooling down LED heatsinks around the world | New LED Cooling technology


--------------------------------------------------------------------------------------------------

PS: if lamp is NOTGET WARMER to HOT (depends on lamp parameters and output ) then is something wrong ( bad thermal contact (or even isolated - led would turrn blue and then die ) , low current on led then maens low power output )