Bar meter color change on warning time need help

[EvilMaddness]

Hey everyone This lua code works fine as is for WeakAuras2

function(progress, r1, g1, b1, a1, r2, g2, b2, a2)
    local start, duration, enable = GetSpellCooldown("Mind Blast")
    local warning_time = 3
    local progress = start + duration - GetTime()
    if start>0 then
        if progress < warning_time then
            return r2, g2, b2, a2
        end
    end
    return r1,g1,b1, a1
end