Remember - ONE photo for the assignment (up to 600px on the longest side), clearly flagged with "Assignment: Light Play" and making date information (normally via EXIF). That is if you want to have your images be counted in the weekly round-up with a chance of being shown on the DPS blog.
There is no obligation to take part in that and it won't necessarily mean that you learn more from the exercise but we moderators end up with a lot of pictures to sort through so any excuse is welcome to skip over a few of them
Wulf