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White light is no longer safe to use as a lighting source after dusk due to its notorious effect on suppressing the generation of the oncostatic hormone,melatonin.The blue light within also exhibits a strong negative impact on the retina of human eyes as well as discolors the masterpieces of van Gogh and Cezanne.To echo the call for a human- and artwork-friendly light source that is free of blue emission or low in color temperature to safeguard human health and artworks,we demonstrate herein a candle light-style organic light emitting diode (OLED) with a color temperature varying around 1,900 K and a color rendering index,CRI,above 85,and an efficacy at least 600 times that of candles or 6 time that of incandescent bulbs.Most importantly,a sensationally warm candle light-style emission is driven by electricity in lieu of the hydrocarbon-burning candles invented 5,000 years ago.This candle light-style OLED may serve as a safe measure for illumination especially after dusk.It may also be used to replace the traditional metal halide lamps or white LED lamps currently used in many museums and galleries that impose high potential in speeding up artwork deterioration.