Using a Light Sensor to Detect Field Gaffers Tape

[pietroglyph]

I'm interested in detecting the gaffers tape field markings for autonomous guidance using a light sensor. If you have any experience with this type of sensor, especially for this specific application, then I'd love to hear about it. To give you more to work off of, I'm interested in these questions specifically:

• Are light sensors difficult to implement?
• Are they reliable for detecting the gaffers tape on the field?
• Do you have any recommendations for specific sensors?

I've seen this used in FLL, and I think that a light sensor was included in the 2004 kit of parts for this purpose, but I haven't been able to find anything much more relevant or specific.