strips with individual brightness problem

// this does not compile
#include "FastLED.h"
FASTLED_USING_NAMESPACE

#if defined(FASTLED_VERSION) && (FASTLED_VERSION < 3001000)
#warning "Requires FastLED 3.1 or later; check github for latest code."
#endif


#define DATA_PIN_L    14
#define CLK_PIN_L     12
#define DATA_PIN_R    13
#define CLK_PIN_R     15


#define LED_TYPE    APA102
#define COLOR_ORDER BGR
#define LED_COUNT       340
#define LED_COUNT_LEFT  170
#define LED_COUNT_RIGHT 170
CRGB leds[LED_COUNT];
//CRGB LEFT[LED_COUNT_LEFT];
//CRGB RIGHT[LED_COUNT_RIGHT];

#define BRIGHTNESS       128

void setup() {

  delay(1000);
CLEDController LEFT  =  FastLED.addLeds<LED_TYPE,DATA_PIN_L,CLK_PIN_L,COLOR_ORDER>(leds, LED_COUNT_LEFT).setCorrection(DirectSunlight);
CLEDController RIGHT =  FastLED.addLeds<LED_TYPE,DATA_PIN_R,CLK_PIN_R,COLOR_ORDER>(LED_COUNT_RIGHT, LED_COUNT).setCorrection(DirectSunlight);

//CLEDController strip = FastLED.addLeds<WS2812, GRB, 8>(leds, NUM_LEDS);
//CLEDController sign = FastLED.addLeds<WS2812, GRB, 9>(led_sign, NUM_LED_SIGN);

  FastLED.setBrightness(BRIGHTNESS);

}

void loop () {
 LEFT.showLEDs(255);
 RIGHT.showLEDs(128);
  }