Ball L.E.D.'s were first made by Dialight for Traffic lights in the early 2000's, however this kind of L.E.D. did not show up on crossing's until around 2003 or 2004.  These can be found heavily on BNSF, with semi regular use on CSX and CN.

Safetran has an agreement with Dialight to resell this type of L.E.D. through their website. This kind of L.E.D. light is available in 12". They do sell 8" lights for traffic lights and wayside signals. It's unknown if any kind of 8" light will work as a crossing signal light.

There are three types of Ball L.E.D. models out in the market Today: the 433, 433 Low Wattage, and 443 series. The only difference between the 433 and 443 is that the 433 comes with side light indicators, and the 443 does not.  The 433 Low Wattage has a checkerboard pattern LED as opposed to the diamond shape of the 433 and 443.  The Low Wattage version is not as popular as the 433 and 443, but can be seen on CSX and a few shortlines.

Safetran sells the ball L.E.D. as the model FLX-4000. It's the same light as the 433 series. It contains side light indicators.

The 433 and 443 can work on A/C or D/C power between 5-16 volts, and will operate in temperatures from -40°C to +70°C (-40°F to +158°F).

The 433 Low Wattage is the same, except it works between 8-16 volts.

Four different models were available via Safetran for this LED:

FLX-4000 MODULE ONLY, w/o HEAD: $428.00 as of 2009.

FLX-4000 w/STEEL VISOR & BKBRD: $461.00 as of 2009.

FLX-4000 w/POLY VISOR & BKBRD: $571.00 as of 2009.

FLX-4000 w/ALUM. VISOR & BKBRD: $533.00 as of 2009.