color temperature

TP-Link Kasa Smart KL-series Wi-Fi light bulb review: Three new smart bulbs offer mostly great results


TP-Link has given its Kasa Smart Wi-Fi light bulb line a significant upgrade. The old LB series has given way to the new KL series, which dramatically upgrades the design of the bulb (for better or for worse) while leaving the core operational features intact. The Kasa KL series is available in three versions: a color-tunable bulb (KL130), a white-tunable bulb (KL120), and a white dimmable/non-tunable bulb (KL110). All three share the same physical design (with minor cosmetic exceptions), work via the same Kasa Smart app (available for Android and iOS), and offer the same luminosity of 800 lumens (a 60-watt incandescent equivalent). The KL130 draws 10.5 watts, while the two white bulbs each pull 10 watts.

Meta-Learning for Few-shot Camera-Adaptive Color Constancy Machine Learning

Digital camera pipelines employ color constancy methods to estimate an unknown scene illuminant, enabling the generation of canonical images under an achromatic light source. By taking advantage of large amounts of labelled images, learning-based color constancy methods provide state-of-the-art estimation accuracy. However, for a new sensor, data collection is typically arduous, as it requires both imaging physical calibration objects across different settings (such as indoor and outdoor scenes), as well as manual image annotation to produce ground truth labels. In this work, we address sensor generalisation by framing color constancy as a meta-learning problem. Using an unsupervised strategy driven by color temperature grouping, we define many related, yet distinct, illuminant estimation tasks, aggregating data from four public datasets with different camera sensors and diverse scene content. Experimental results demonstrate it is possible to produce a few-shot color constancy method competitive with the fully-supervised, camera-specific state-of-the-art.

LIFX Mini smart bulb series review: Not quite as bright, but smaller and cheaper than the LIFX A19


At some point, LIFX surely heard the complaints one too many times: Your bulbs are great, but they're too big, too heavy, and--well--they just look weird. Clearly bowing to consumer sentiment, LIFX has introduced a second series: LIFX Mini. As the name implies, these three bulbs are indeed a bit smaller and easier to fit into most fixtures. One of them takes home TechHive's Editors' Choice award. Ejecting the cylindrical design of its earlier smart bulbs, which remain on the market, the bulbs in the Mini line look a bit more traditional.

Eufy Lumos Smart Bulb review: Alexa-ready and budget-friendly smart lighting from Anker


Wi-Fi-enabled smart lights are rapidly becoming commodities, and it's exciting to see prices plummeting to the point where they make sense for just about everyone. The latest: Eufy, a sub-brand of everything-goes electronics manufacturer Anker, just hit the market with two new affordable Edison-style smart bulbs: a $30 tunable-white bulb and a $20 fixed-white bulb. Eufy ticks off nearly all the specs one could ask for in a smart lighting system. Both the tunable and white-only bulbs operate at a solid 800 lumens while drawing 11 watts of power, work without a hub, and can be controlled with voice commands via Amazon's Alexa digital assistant. The bulbs even support external dimmers (though you may encounter trouble with the wireless radio working while they're dimmed).

C by GE Sol review: GE has transplanted Alexa's brain into a funky lamp


The C by GE Sol ($200) is the first lamp I've seen that fully incorporates Amazon's Alexa digital assistant. If you can get past its 1950s sci-fi aesthetic, it could be a good addition to your smart home. This goes double if you also use C by GE smart bulbs. I control 95 percent of my home's indoor and outdoor lighting using Amazon Echos and Echo Dots, so I'm accustomed to the convenience that the Sol offers. I used the latter pronunciation a few times, and Alexa kept hearing "salt.")

GE's Alexa-powered smart lamp opens the floodgates for voice-controlled everything


Amazon's Alexa voice assistant can no longer be contained to the company's Echo devices. From smartwatches to Echo clones like the Eufy Genie, device makers are eager to integrate Alexa voice controls into everything imaginable. Late last year, GE announced the C by GE Sol, the world's first Alexa-powered smart LED lamp that requires no additional hardware or setup, and now it's finally available. You plug it in, connect your Amazon account, and -- boom -- you're living in the future. I've been trying out the Sol for the last couple of days and it's slowly started changing my routine for the better.

The best smart bulbs for Amazon Alexa, Siri, and more


If you make a purchase by clicking one of our links, we may earn a small share of the revenue. However, our picks and opinions are independent from USA TODAY's newsroom and any business incentives. We've come a long way since we first looked at smart bulbs back in 2015, but there's one thing that hasn't changed. If you want the best smart bulb for your money, then you should get the Philips Hue White and Color Ambiance Starter Kit (available at Amazon). If this is your first time exploring the world of smart bulbs, there are a few things you should know.

Best white LED smart bulbs


With their rainbow of hues and myriad party tricks, color-tunable LEDs get all the press in the world of smart lighting. It's fun stuff, but the reality is that most of us will rarely find much of a need to turn all the lights in the house blue or red--unless it's time to celebrate our team winning the World Series. Even then, you'll probably want to turn them all back to white after the celebration. White light is also important in its own right, as today there is plenty of science to show how various shades of white--with variations in color temperature--impact our psychological state. Cool light that's closer to blue has an energizing effect, and is best in the morning.

Are LED streetlights really the best answer to more efficient light sources?

Christian Science Monitor | Science

In a quest to reduce energy use, many communities across the country are swapping out high-pressure sodium streetlights for much more energy-efficient LED lights. But some of the most commonly used LED lights, which tend toward the blue part of the spectrum but appear white to the human eye, could work against helpful intentions to light up the dark, according to a new report by the American Medical Association. That's because LED lights that emit a large amount of blue light can disrupt circadian sleep rhythms in humans and animals, says the study, as Take Part reports. The new lamps can have an impact that five times greater than traditional street lamps on circadian rhythms, the AMA says. In addition to increasing glare for nighttime drivers, "[r]ecent large surveys found that brighter residential nighttime lighting is associated with reduced sleep times, dissatisfaction with sleep quality, excessive sleepiness, impaired daytime functioning and obesity," the group says in a statement.