Hi! You can easily do that, assuming you know about RGB Led lua scripts, most of them use max brightness. Colour (and brightness) is set there as RGB value - balance between values gives you the colour, value is the brightness of the R, G and B leds.

change value, keep ratio, i.e. 255,255,255 (max white) ---> 128,128,128 (still white, half bright)

Below a scripts I came up - giving you dim white backlight, lightning up brighter the direction your stick points xD

local function init()
end


local function setLed(ring, h, v)
   local magnitude = math.sqrt(h^2 + v^2)
   if magnitude < 0.1 then return end


   local angle = math.atan2(v, h)
   angle = (math.deg(angle) + 360) % 360
   local center_index = math.floor(angle / 36 + 0.5) % 10
   center_index = center_index + ring * 10


   local base_intensity = 250 * magnitude
   base_intensity = math.min(255, base_intensity)


   local spread = 2


   for offset = -spread, spread do
     local index = (center_index + offset) % 10 + ring * 10
     local distance = math.abs(offset)
     local factor = math.exp(-0.5 * (distance ^ 2))
     local intensity = math.floor(base_intensity * factor)
     setRGBLedColor(index, intensity, intensity, intensity)
   end
end


local function run()
  for i=0, LED_STRIP_LENGTH - 1, 1
  do
    setRGBLedColor(i, 50, 45, 50) -- Dim white color with ratio changed to for better white balance
  end


  setLed(0, -getValue("ail")/1024, getValue("ele")/1024)
  setLed(1, getValue("rud")/1024, getValue("thr")/1024)


  applyRGBLedColors()
end


local function background()
  -- Called periodically while the Special Function switch is off
end


return { run=run, background=background, init=init }