Run tunable white (HCL)

[admin]

Here's my version with linear transition. Values at 0:00 and 24:00 are mandatory, values in between can be added as needed.

Code:

function tomins(hour, min)
  return hour * 60 + min
end

points = {
  { hour = 0, min = 0, value = 2500 },
  { hour = 7, min = 30, value = 2500 },
  { hour = 8, min = 0, value = 3000 },
  { hour = 9, min = 0, value = 5000 },
  { hour = 16, min = 0, value = 5000 },
  { hour = 17, min = 0, value = 3000 },
  { hour = 18, min = 30, value = 2500 },
  { hour = 24, min = 0, value = 2500 },
}

now = os.date('*t')
currmins = tomins(now.hour, now.min)

for i, point in ipairs(points) do
  nextmins = tomins(point.hour, point.min)

  if nextmins >= currmins then
    nextpoint = point
    prevpoint = points[ i - 1 ] or nextpoint
    prevmins = tomins(prevpoint.hour, prevpoint.min)
    break
  end
end

deltamins = nextmins - prevmins
if deltamins > 0 then
  delta = (nextpoint.value - prevpoint.value) * (currmins - prevmins) / deltamins
else
  delta = 0
end

value = math.floor(prevpoint.value + delta)

log(now.hour, now.min, value)