| Electronics > Projects, Designs, and Technical Stuff |
| New LED lights reliability |
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| schmitt trigger:
Purchased 3 Toshiba bulbs 10 years ago. They are my home's exterior night lights, turned on automatically via a photocell. Have operated reliability every single night. Can't recall whether they were made in Japan or elsewhere. OTOH, some of my recent purchases have lasted only a few weeks. I have kept some of the worst offenders, to make a teardown comparison vs the Toshiba. As soon one of those burns out, of course. |
| jmelson:
--- Quote from: djacobow on February 09, 2019, 04:45:42 am ---Spot the section where they mention it can't be used in an enclosed fixture? It's there. --- End quote --- WOW, a LOT of disclaimers! At least it didn't have something about wearing safely glasses or an arc flash suit when changing the bulb. But, next year they will probably add that. Jon |
| Zero999:
--- Quote from: jmelson on February 10, 2019, 06:38:32 pm --- --- Quote from: djacobow on February 09, 2019, 04:45:42 am ---Spot the section where they mention it can't be used in an enclosed fixture? It's there. --- End quote --- WOW, a LOT of disclaimers! At least it didn't have something about wearing safely glasses or an arc flash suit when changing the bulb. But, next year they will probably add that. Jon --- End quote --- Health and safety: very important! https://youtu.be/vXok6_BjhXM |
| OwO:
--- Quote from: Kjelt on February 10, 2019, 12:02:30 pm --- Very good thermal and electronic design, BOM was around $15 selling price $60 and almost nobody bought them: too expensive while it is still a bargain compared to conventional bulbs. That is what I am telling you, consumers don't want to pay lot more money for their bulbs so the manufacturers have to follow the cheaper, less lasting commercial bulbs. --- End quote --- Well, the reality is that very few people are in the market for a $60 11W light bulb. Here for that price you can get an entire ceiling-mount fixture with LED strips and power supply included (and not shitty ones either) as well as delivery and installation, 100W, bright enough for a big living room (most I've heard complain about it being too bright), dimmable, and excellent thermals. Part of the reason why China crap is regarded as low quality is because retailers push the cost down too much and pocket way too much profit. To sell $8 bulb the retailer will source a $3 bulb, well no shit it's going to be garbage. I like my rooms really bright and it would be simply uneconomical to fit LED bulbs to desired brightness even at the $8 price point. The 11W bulbs have less efficient drivers than the big 100W panel, and I would probably need 12 bulbs to cover my room. |
| schmitt trigger:
--- Quote from: OwO on February 11, 2019, 07:26:32 am --- Part of the reason why China crap is regarded as low quality is because retailers push the cost down too much and pocket way too much profit. --- End quote --- Is not only electronics. Actually the clothing industry is far, far worse. How can a designer's blouse cost US$80 or more, when it is made in Vietnam or Bangladesh? But returning to the topic at hand. I've found a trick which greatly enhances LED lamp life, specially if they are used in enclosed luminaries: Use a dimmer (set to a fixed position) to limit the lamp's power to 70 or 80% of rated power. As discussed in a previous thread, I have used a light and a power meter, and found that 30% power reduction is only about 15 to 20% light reduction. |
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