In the previous attempt to increase the output from a basic Solar Garden Light (SGL), publishedhere,
we quickly reached a limit: the brighter we make the light, the quicker we deplete the battery, or more properly, the charge we can obtain from the sun during the day.
The solution was apparent: make a flashing SGL. Not only is it much more readily noticeable, and hence, more effective against would-be intruders; it also conserves battery power, so that the battery will last a long time.
The difficulty was designing a circuit that could be made from easily obtainable and inexpensive parts. The result is a simple flashing circuit using only ONE transistor, powered by a single rechargeable battery.And, a simple enhancement of 2 parts will more than triple the light output.
And it is effective - after 4 days of storm & rain, with only the rechargeable from the old light, it's still going strong.