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by hagbard_c
15 hours ago
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These are 'A++' marked LED bulbs according to the old energy label standard which would be between C and D in the new label standard. They're supposed to last for '15 years' according to EC 1194/2012 [1] (2.7 hours/day, 15000 hours) and survive 100000 power-on/off cycles. In reality they last for about 1500-2000 hours in well-cooled fixtures. The lamps I'm referring to have 4 wide (4mm) LED filaments in a normal-sized glass bulb. On the packaging they're marked 'Ledvance' [2]/made in China, i.e. they carry the Osram brand under licence. In other words LED lamps can be made to last a long time but many are not, brand names and brand pricing notwithstanding. The form factor - E27 socket with glass bulb, fluorescent tube replacement, large heat sink mounted LED strip - does not play as much of a role as you'd think given that the lights with the 'best' cooling (LED strip mounted on a large heat sink) shows the highest failure rate while the 'traditional incandescent lamp' form factor with the electronics in the E27 base shows both the lowest as well as the second-highest failure rate here. It probably comes down to component quality, something which again does not seem to be related to brand name. [1] https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:... [2] https://www.ledvance.com/00_Free_To_Use/asset-8344755_THE_AS... |
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