Hi Gary, The DDC light is the one talked about on the doording.com forum. Made by Ricky Bayne who owns that said forum, if you have a look on there you will see some picture.
When I have guys here for training I let them play with 4 or 5 different reflective sources all plump for the DDC light. I showed on to the Vauxhall plant they now have 8 on the production line, likewise BMW are showing an interest in it, it just gives off the most amazing fog.
I do use it a lot outside, although there are days when it is just too sunny, but not often, I also carry a gold reflective straight bar from Dentex and a reflective board from Inventure. I suffer from double vision so it is very important for me to use the best reflective source for what my eye's need in the conditions.
What I will add is that not everyone can get on with the same fog, or reflective source, I think there it is good to try a few even the most experienced guys can find new ways and methods, makes for a great trade.
