Mains power lamp

[David, K3TUE]

In many tube-type circuits I see it common to use an incandescent lamp run from secondary side filament power to indicate mains power on.

In the power supplies I am working on I do not have this luxury.  So I was wondering if using a simple and cheap neon lamp on the primary side is ok instead, or are they somehow problematic?  I was wondering if they tend to induce unwanted noise into the supply that will end up in my signal.

[WA1GFZ]

Neon bulbs last for ever I prefer them on the primary.

[The Slab Bacon]

dont forget the 100k current limiting resistor 

[k4kyv]

And they require about 67 volts or thereabouts to fire, so they wouldn't work off an ordinary filament winding anyway.