Using a 106 series SCR, this circuit was found in the May 1971 Radio Electronics magazine. The quiescent current is very low and is given by the value of R1.
This circuit is from an English magazine of 1977. The circuit is still current, just using a TIP41...
With a touch of the push button the lamp is switched on. A new touch and the lamp go out, in this...
The transistor for this flashlight brightness control may be the BD135. The circuit is from 1978...