<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>mrtksn</author><text>My living room is lit through 30(3W 240V) LEDs. I installed them about 2 years ago and nearly half of them are gone. The lifetime of these is supposed to be 20K hours. Obviously the lights are not switched on all the time, more like 4 hours on average. That&amp;#x27;s less than 3K hours of usage with about %50 fatality rate.&lt;p&gt;Out of curiosity, I teared down a few failed ones and they were all gone because one of the LEDs on the LED array blew up. Here is a picture of a failed one: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;imgur.com&amp;#x2F;aOg7D7S&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;imgur.com&amp;#x2F;aOg7D7S&lt;/a&gt;&lt;p&gt;I&amp;#x27;m very doubtful about the longevity claims.</text><parent_chain><item><author>xxs</author><text>The power factor is 0.5 which is appalling - can&amp;#x27;t really get lower than 0.5 with capacitive load. Industrial clients do pay for the VA (apparent) than W (actual) power. But even then most urban EU power network is dominated by capacitive loads as the inductive ones tend to use 3-phase 400v (which is balanced)&lt;p&gt;Most of the constant current driven LED would have similar characteristics when they are not overdriven. 25KHz+ PMW driven LED would have similar features as well. It&amp;#x27;s not hard to make LEDs that actually last and have high lumen&amp;#x2F;watt ratio with off the shelf components.&lt;p&gt;Overall the main culprit is the LED installation mechanism, e.g. E27 - there is just not enough room to make efficient light out of that. Near ceiling lights do look better (at least to me) and they can have both not overdriven LEDs (say 90mA per 5730), high (over 87%) power factor, decent passive elements... and they are repairable with some electronics background.</text></item></parent_chain></comment><story><title>Philips LEDs from Dubai: The Royal Lights You Can’t Buy</title><url>https://hackaday.com/2021/01/17/leds-from-dubai-the-royal-lights-you-cant-buy/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>dvdkon</author><text>You can have plenty of LEDs and a reasonable switching PSU in an E27 lamp, it&amp;#x27;s just harder to cool them with the typical design. Most LED lamps use ridiculously few chips, you could fit multiple times more even on the one-PCB designs, not to mention &amp;quot;corn cob&amp;quot; arrangements or those with LED filaments. That&amp;#x27;s not to say E27 is an ideal form factor for LEDs, I&amp;#x27;m hoping we&amp;#x27;ll see more and more homes with LED-optimised lighting designs.</text><parent_chain><item><author>xxs</author><text>The power factor is 0.5 which is appalling - can&amp;#x27;t really get lower than 0.5 with capacitive load. Industrial clients do pay for the VA (apparent) than W (actual) power. But even then most urban EU power network is dominated by capacitive loads as the inductive ones tend to use 3-phase 400v (which is balanced)&lt;p&gt;Most of the constant current driven LED would have similar characteristics when they are not overdriven. 25KHz+ PMW driven LED would have similar features as well. It&amp;#x27;s not hard to make LEDs that actually last and have high lumen&amp;#x2F;watt ratio with off the shelf components.&lt;p&gt;Overall the main culprit is the LED installation mechanism, e.g. E27 - there is just not enough room to make efficient light out of that. Near ceiling lights do look better (at least to me) and they can have both not overdriven LEDs (say 90mA per 5730), high (over 87%) power factor, decent passive elements... and they are repairable with some electronics background.</text></item></parent_chain></comment><story><title>Philips LEDs from Dubai: The Royal Lights You Can’t Buy</title><url>https://hackaday.com/2021/01/17/leds-from-dubai-the-royal-lights-you-cant-buy/</url></story>