The Leotek LEDs first started appearing in 2015 on some CSX crossings, at first alongside 2nd Gen WCH LEDs, and now CSX seems to use these as their primary LED.  Omnitrax has also been using these on some railroads, including Illinois Railnet and the NOW Railroad.  Most installations use WCH frames though.

Leotek offers 2 versions of their LEDs; the EV series and the IL series.  The EV (Extended View) series is what has been seen on CSX and Omnitrax, and is very similar to 2nd Gen WCH LEDs, except they don't protrude outward as much, and there is no cluster of lights in the center of the module.  The IL (Incandescent Look) series is very similar to the Low Wattage Dialight LEDs.  So far, none of the IL Series have been seen in service.

There are 4 versions of the EV series for sale.

• TSL-12RCS-EVW-E1-CC with White Side Lights (9.8 wattage drawn, as opposed to 10 with the other 3)
• TSL-12RCS-EVW-E1 with White Side Lights
• TSL-12RCS-EVW-E1 with Red Side Lights
• TSL-12RCS-EVW-U1

There are 2 versions of the IL series for sale.

• TSL-12RCS-ILR-E1 with Red Side Lights
• TSL-12RCS-ILW-E1 with White Side Lights

Temperature ranges for both series ranges from -40°C to +70°C (-40°F to +160°F), and operate from 8 to 20 volts D.C. and 8 to 16 A.C.