You got to "make the connection"
Lumenoks work by requiring the arrow "or collar in this case" to provide part of the circuit. Where the Lumenoks contacts touch the back of the collar it must be clear of the colored coating. The anodization which provides the color is non-conductive. Dale_B1 is correct. I personally use the collars. They are a more durable conductor than the carbon, and protect the shaft from strikes.
We at the Burt Coyote Co. also have a new color. We introduced green Lumenoks in our Signature nock and in our Gold tip nock this year. You won't see it on our web site yet, but hopefully in the next 2 weeks. If you have questions, please call. 309-358-1602
They are also available at dozens of retailers today.