The main components of a gas oven system are the safety valve, the burner assembly, the igniter, and some form of control. The control can either be a thermostat that we all are accustomed to, or an electronic control.
The amount of current draw within this circuit is determined by the resistance of the igniter. All oven igniters are matched to the oven safety valves by the manufacturer of the oven. It is extremely important that you do not mix and match igniters with different oven safety valves. Always use the model number of the oven or range and select the oven igniter and safety valve recommended by the manufacturer.
And finally, it is possible for an oven ignitor to glow red and still be defective. That's because the resistance of the ignitor is what determines whether or not gas will flow from the oven safety valve. If the resistance of the oven ignitor is only down slightly, it can still glow red but not draw enough current to allow the oven safety valve to open giving the illusion that it is not defective.