This circuit is from a 1969 General Electric manual. The SCR may be the TIC106. Similar circuits from other sources are found on this website.
LEDIL provides through Mouser Electronics a series of lenses for use in greenhouse horticulture....
We found this circuit in a 1997 documentation. It can drive sets of LEDs or lamps through SCRs in...
Found in a 1977 publication this circuit can supply current up to about 20 mA set on the...