Umm... I'm not planning to use them as anti-collision lights or the like. The requirement is to have a 1) a landing light AND 2) a taxi light independent of each other. We can have the two in a single lamp or use two separate lamps. That is where I am stuck. I can't seem to find a lamp with two separate filaments. So basically I just need a lamp that has two filaments that can be switched on or off independently of each other.