diff --git a/server.js b/server.js
index 1e2e82b..d76662a 100644
--- a/server.js
+++ b/server.js
@@ -35,13 +35,16 @@ const sensehat = {
             flipV(redraw=true)  垂直反转
             setRotation(r, redraw=true)  设置旋转，r初始为0，r只能设置为0/90/180/270
             getter rotation
+            getter and setter lowLight 默认为true
         */
         get pixels() { return sensehat.led.getPixels() },
     },
 }
 
 sensehat.led.clear()
-// sensehat.led.lowLight = true
+sensehat.led.lowLight = true
+sensehat.led.sleep(2)
+sensehat.led.lowLight = false
 sensehat.led.setPixels([
     R, O, O, O, O, O, O, O,
     O, _, _, _, _, _, _, O,