remove gamma correction for now

src/led.cpp

@@ -95,8 +95,9 @@ void Led::setBrightness(uint8_t brightness) {
   if (brightness > 254) { // don't set first byte to 255 on tm1829
     FastLED.setBrightness(254);
   } else {
-    uint8_t b = pow(((double)brightness/255.0), 4.2) * 255.0;
-    FastLED.setBrightness(b);
+//    uint8_t b = pow(((double)brightness/255.0), 4.2) * 255.0;
+//    FastLED.setBrightness(b);
+    FastLED.setBrightness(brightness);
   }
 }