控制可調白光LED為以人為中心的照明

　　由于LED照明系統的成熟，它已不再足以簡單地提供足夠的亮度沒有眩光。隨著研究清楚地表明，環境光影響人類的生物，注意力轉移到控制光源，影響人類的晝夜節律，視力，甚至生產力。

　　在這個人類為中心的照明（HCl）的核心是可調白光LED。然而，設計工程師實施HCl，它是必不可少的，他們開發的電路，暗淡的LED，檢測和改變歐凱文溫度設置，并仍然管理提供必要的亮度輸出。

　　本文將介紹鹽酸及其應用，并介紹了英飛凌的Arduino兼容xmc1202 RGB LED照明的盾牌。然后，它將討論如何屏蔽可用于評估或制作快速原型燈具可調白光LED應用。

　　The light effect

　　HCL relies upon tunable， high-power LEDs and microcontrollers to mimic the changes of natural light during the day. In the morning， light has a reddish color temperature of around 3000 K. By noon it might be 6500 K. In humans， this color temperature change affects the production of several hormones， including melatonin， that play a key role in the human sleep cycle. Melatonin concentrations are higher at night and lower during the day.

　　The eyes also gather light information， in particular the amount of ambient blue light. Specifically， the eyes’ intrinsically photosensitive retinal ganglion cells （ipRGCs） are sensitive to a narrow range of blue light at around 480 nm. Studies have shown that light with a high spectral blue component can activate and increase human performance and concentration. If this blue component in light decreases， the body relaxes and changes over to a calmer， albeit less productive mode.