I could not wait to post this! I just got an email from Ramzi, the spokesman at .PSLAB (you know, PSLAB), who sent me the details for "Jar," a lamp using the efficient G28d lamp. From Ramzi at .PSLAB:
Brief was to develop a light fixture using the G28d energy saving lamp. Proposal is a commonly used jar that can be purchased from any store off the shelf. When closed, it is sealed from outside hazards such as water. The jar is the package. The lamp within it becomes an IP rated fixture.
These images are cool – this is a great idea! I use a few of these types of jars in our home, and in addition to being pretty airtight, they're also very strong – I bounced my pint jar off of the tile floor in the kitchen, and the darned thing bounced!