GE thinks it can you help you sleep better with its GE Aligntm lighting technology. The LED based bulbs are touted as "promoting the body's natural sleep cycles by controlling the blue concentration of light output. By tuning the spectrum of light, GE Align AM bulbs mimic daylight and suppress the body's production of melatonin." The PM version of the bulbs, intended for evening use produce "an amber light, reminiscent of candlelight and campfires, and do not disrupt sleep circadian rhythm."
According to GE, blue light, as emitted by computer screens, tablets, and phones, disrupts the production of the melatonin hormone associated with sleep. The PM version of the bulb reduces the amount of blue light encouraging a natural sleep cycle. Conversely, the AM version with its bluer spectrum aids in a natural wake up cycle.
GE has taken this one step further by announcing a bulb, available later this year, that will work as part Apple's HomeKit connected home technology to permit control of the bulb's spectrum from a phone, tablet, or other device.
Tattooed owners of the Apple Watch are reporting problems with the heart rate monitor function on social media. It seems that the tattoo ink may interfer with the sensor.
According to Apple's website:
"Many factors can affect the performance of the Apple Watch heart rate sensor. Skin perfusion is one....Permanent or temporary changes to your skin, such as some tattoos, can also impact heart rate sensor performance. The ink, pattern, and saturation of some tattoos can block light from the sensor, making it difficult to get reliable readings."
It's possible then that people with darker skin may also experience problems, although it should be noted that the colors and composition of ink differs from skin coloring.
the Apple Watch uses technology called photoplethysmography. Here's how it works, according to Apple:
"Blood is red because it reflects red light and absorbs green light. Apple Watch uses green LED lights paired with light-sensitive photodiodes to detect the amount of blood flowing through your wrist at any given moment. When your heart beats, the blood flow in your wrist — and the green light absorption — is greater. Between beats, it's less. By flashing its LED lights hundreds of times per second, Apple Watch can calculate the number of times the heart beats each minute — your heart rate."
If you rock wrist ink, you might want to try before you buy if monitoring your heart rate is your goal.