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Its funny how you say everything is sunshine and rainbows with lightbulbs, but just yesterday I was reading comments here about how its impossible to find light
by plopz 8y ago
Its funny how you say everything is sunshine and rainbows with lightbulbs, but just yesterday I was reading comments here about how its impossible to find lightbulbs with good temperature anymore.
https://news.ycombinator.com/item?id=16929470 https://news.ycombinator.com/item?id=16929470
- Faaak 8y agoI don't know where you buy your led light bulbs but here in switzerland you usually have three choices (white, warm white, and something yellow-ish). I find the warm-white nuance quite pleasant. Then, if you still want another colour, internet is here for you.
- awakeasleep 8y agoHowever, if you want good full spectrum LEDs (that approach what an incandescent bulb provides) I believe you must buy really expensive ones that are only manufactured in Japan https://www.yujiintl.com/high-cri-led-lighting https://www.yujiintl.com/high-cri-led-lighting
- justinclift 8y agoYou're not understating things when you say "really expensive"... https://store.yujiintl.com/collections/high-cri-led-lights https://store.yujiintl.com/collections/high-cri-led-lights Wow.
- tigershark 8y ago106$ for a pack of 6 led light with CRI > 95 doesn’t seem really expensive to me... It’s less than 18$ each.
- justinclift 8y agoWell, it seems really expensive when I compare to the price of led lights I'm used to. eg local supermarket. :)
- namibj 8y agoI can confirm the quality of the devices they send. And from the shipping it seems to be Shenzen. Their 1900K VTC (triple-phosphor) LEDs seem to be out of stock though. They have 80+CRI on candlelight. DIY Perks (youtube) got some and made a video destribing the difference between their double phosphor and 'normal' chinese LEDs. One can see the quality of the actual LEDs (not the packaging/phosphor(s)) by running them at threshold voltage, and seeing if all dies in the package light up simultaneously. If they don't, the device is of 'chinesium' quality. Ask for a refund, as it's going to burn out soon (uneven current distribution between the parallel columns). And as far as "really expensive" goes: the price of the LED is 10% of the electricity cost over a life of 50k hours, which is about what you get out of them without fancy cooling. See http://www.wolframalpha.com/input/?i=Plot%5B(1000.+%2B+0.2+x)%2F1000,+%7Bx,+0,+50000%7D%5D http://www.wolframalpha.com/input/?i=Plot%5B(1000.+%2B+0.2+x... , for TCO over time. Units are EUR and hours, and I calculated a price of 20ct/kWh. You can take these prices as net prices for USD, tax and forex cancel out. Yes, these are not economical if you don't use them. In that case, use cheap filament bulbs or similar. Don't cheap out on the quality of light you use. Get double phosphor (other manufacturers offer those too) for normal use, and consider triple phosphor for uses where color rendition is particularly important (photo shooting/inspecting things/etc). For the mentioned price you can get a cheap driver and the LED, but please don't burn your LED with inadequate cooling or a bad driver. They are not cheap ;)
- rashkov 8y agoDo you use these for home lighting, and if so, how do they compare to traditional CFLs? Or would that be total overkill?
- iamphilrae 8y agoThey maybe be expensive but will last a decade or longer, so price is negated. And when you replace in 10 years, price will be minuscule as to what it is now.
- sergiosgc 8y agoYou may be viewing the past with a rose filter. Incandescent light bulbs are nowhere near full spectrum. You have a decent analysis of the emitted frequencies here: https://www.comsol.com/blogs/calculating-the-emission-spectra-from-common-light-sources/ https://www.comsol.com/blogs/calculating-the-emission-spectr...
- the8472 8y ago> You have a decent analysis of the emitted frequencies here: That still shows something approaching a black body radiatior. The difference is just the planckian locus. In other words it does emit a full spectrum, just with a power distribution that mimics sunset light and not midday sunlight.
- lightedman 8y ago"Incandescent light bulbs are nowhere near full spectrum." If you're considering microwave, radio, X-ray, and UV-C as part of full spectrum, sure. Otherwise, incandescents emit across the entire visible spectrum as a result of being a blackbody radiator. I'm even working with Scripps Institution of Oceanography on an experiment regarding exactly this right now.
- jupp0r 8y agoI assumed that full was always a relative term. You surely don't want devices that emit on the whole EM spectrum.
- closeparen 8y agoI remember the transition, and “A/B testing” different rooms in my parents house as our last incandescents died, quite vividly. It was awful. It still is, but people no longer have good quality light for comparison.
- GuiA 8y agoAnd you no longer have a room lit with incandescent to compare with the current, much improved offerings :)
- njarboe 8y agoFor daytime hours I would like something approximating the suns spectral output. Something like a black body at around 5800K. Lots of blue but pretty flat in the visual spectrum. For the evening I would prefer more of a wood fire or candle light spectrum. That seems to help with people's sleep cycle. Something with a black body temp of about 1500 K. Or cool incandescent if you are reading; around 2400K. Majority red spectrum.
- luckydata 8y agoIt already exists. https://www.usa.philips.com/c-m-li/warm-glow-dimmable-led-lighting https://www.usa.philips.com/c-m-li/warm-glow-dimmable-led-li...
- daveFNbuck 8y agoIt's weird that their website gives no indication that they function this way. They don't say anything about blue light or sleeping better.
- herbst 8y agoPhillips and some other known brands sell a wide spectrum of different LED bulbs these days. Some are way better than others. I am sure someone is making the 'best' but the better average is not as bad anymore IMO.
- the8472 8y agoOn amazon you'll find a plethora of LED bulbs with their color temperature in kelvin, CRI (or R-alpha), lumens and directivity listed. I have picked a wide range of different ones for different needs. A few years ago there was limited choice but the palette has broadened since then. The item titles, often listing incandescent equivalent wattages and fuzzy categories like warmness, are kind of irrelevant. You need to look at the fact sheets.
- DubiousPusher 8y agoDisagree. I just swapped a 2700k bulb for another 2700k bulb and the room went from eery green to warm just off white yellow. You have to try them. The ratings are suspect, IMO.
- tigershark 8y agoThe warmth has no relation whatsoever with the CRI. If your first led had an awful CRI you should blame yourself for not checking it rather than saying that all the spec sheets are useless.
- DubiousPusher 8y agoOh! I didn't know about this property. Thanks, this will be very helpful in picking bulbs in the future.
- deleted 8y ago[deleted]
- DubiousPusher 8y agoNo way. Tons of warm, white or cool bulbs. You just have to try a few and be sceptical of the kelvin rating. Trust me, the wife and I are very picky about color temp.
- PhasmaFelis 8y agoWell, if you have extremely specific desires for light temp.
- Tepix 8y agoBuy good LED lights with a CRI of >95. They are not hard to find.