Electronics > Repair

Why/how do these LED lamps fail so fast?

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coppice:
The filament style LEDs keep the heat away from the base. So, the driver, and especially the capacitors in the driver, are not being roasted. The driver itself is only a small part of the dissipation of the lamp in any sanely designed LED lamp. The interesting thing is at first sight those filaments look like their cooling will be really poor, but they actually seem to get the heat into the surround gas quite effectively. An IR camera doesn't show them as major hot spots. This is great for a reasonably cool running exposed lamp. However, if you put one in an enclosed luminaire, do they slowly cook if the lamp runs for hours?

A general problem with luminaire design is their designers still seem to be living in the era of incandescent lamps, and haven't even caught up with CFLs. Their idea of adequate cooling is based on an incandescent lamp which is more efficient with poor cooling, and heat issues are all about not catching fire, or setting fire to the surroundings. I mean, its pretty common for luminaires to keep falling off the ceiling if you use incandescent bulbs and fix them with plastic screw hole plugs. The designs assume they won't be able to set the ceiling material on fire, but don't allow for softening a plastic hole plug enough for the screw to gradually pull out.

IanB:
Pictured below is the packaging for a Feit Electric bulb. It shows an enclosed outside lantern fixture as a possible use.

Also pictured is the packaging for a Philips bulb. It says "Suitable for use in enclosed fixtures."

The packaging for some GE candle bulbs (not pictured) says "Use in totally enclosed fixtures may result in lower lamp life."

coppice:

--- Quote from: IanB on November 24, 2024, 10:13:05 pm ---Pictured below is the packaging for a Feit Electric bulb. It shows an enclosed outside lantern fixture as a possible use.

Also pictured is the packaging for a Philips bulb. It says "Suitable for use in enclosed fixtures."

The packaging for some GE candle bulbs (not pictured) says "Use in totally enclosed fixtures may result in lower lamp life."

--- End quote ---
Those Philips Ultra Definition bulbs seem to hit all the right points. Dimmable, suitable for enclosed luminaires, low flicker, high CRI, and cheap. They don't appear to offer anything similar in Europe, and the less capable products they do offer are more expensive.

David Hess:
After testing various LED bulb brands from Home Depot and Lowes to quick destruction, I starting buy just Cree bulbs online and I started experimenting with their smart bulbs not long after Cree was sold and everything broke when their bulb designs were silently changed.  I have been using Wiz bulbs since, but 100 watts equivalents (14.5 watts) are not bright enough for me.

I thought tunable bulbs would help me with seasonal affective disorder but I cannot tell any difference.

coppice:
I was just looking at the Philips LED offerings in the UK. They have this page https://www.lighting.philips.co.uk/consumer/led-lights/quality-of-light-led-lighting on the importance of high CRI. That page links to their actual high CRI lights, where it says "We can't find any products that match your selection". :)

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