activated portable emergency light (if connected direct with a 12V battery without transformer) and also for many other purposes.
The circuit is build around a 555 timer IC. A 2N6122 transistor is working as a switch. A 110 or 230V primary to 9V secondary 1A step down transformer is used for powering the circuit. You can also add 3 to 4 more 1 watt LEDs in parallel with a 27 ohms resistor with each LED but also make sure to use a higher current ratings transformer like 2 or 3 ampere with a 5 ampere diode bridge. You can also operate the circuit with a 12 volt battery. The circuit for 12V battery is shown in figure 2. 

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The figure below shows a project / schematic of a touch lamp circuit. The circuit will activate and deactivate two 1 watt LEDs by touching the ON and OFF connections shown in the circuit. This circuit can be used for variety of purposes like as an LED table or reading lamp, LED night light / lamp, touch

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Figure 1.
Figure 2.
Touch Lamp Circuit Schematic