If the lamp does not ignite, an electronic circuit stops the operation of the ballast. Modern Doubles.

For use with Gray's Needle Tubes, I would recommend sewing needles in size 8 or 9 which have a diameter of 0. Loss of mercury will take over from failure of the phosphor in some lamps.

Gas discharge lamps Analog circuits Resistive components Electrical power control Electric power systems components. Ballasts can also be used simply to limit the current in an ordinary, positive-resistance circuit.