Are you reaaaally sure this is a LED tube? Because if this is a fluorecent tube this can make more sense:

Fluorecent tubes works with two filaments heating up both ends of the lamp (when is turned on) just for heating the gas inside, allowing a large spark jumping from one end to other. After that, the filaments doesn't work anymore because the current is passing through the gas instead of the full circuit with both filaments (the gas is the shortest path)

But if you have low voltage maaaaybe the spark can't jump from one end to the other so the filament never shuts down and this would explain the orange bright (its not intended for ilumination, its just a heater so it can damage the lamp being turned on too much time)

By the way if a flurecent lamp has too much length for the voltage applied, it will turn on halfway because the ionized gas will emit some UV light, but the gas resistance is enough for not allowing full current passing through the lamp, the gas is just electrified in the "live" end (and if you touch the lamp, it will work like a "plasma ball", emiting more light where you touch the glass of the lamp, because the electricity doesnt have anywhere to go so your hand added the huge resistance of the glass is the shortest way to go, the isolation of the glass makes the lamp not dangerous for touching tho)

But if you are sure your lamp is led, so you have a huge faliure in the circuit not "just low voltage", and some diodes are suffering in hell for too much current, with the light changing from "cold wite" to "orange", i dont think this is the case

More info about flourecent lamps here