i hope so: trudie expresses optimism or anticipation that the shop assistant can help her find a table lamp.
at all: trudie is emphasizing that she is studying with no lamp whatsoever, solely relying on the light from the window.
it comes in: refers to the available options or variations of the classic desk lamp, indicating that it is offered in various colors.
light bulbs: these are the devices that produce light in the lamp. in this context, the desk lamp is sold with led light bulbs, suggesting the type of bulbs that come with the lamp.
on special offer: indicates that there is a discount or a reduced price for the desk lamp due to ongoing promotions or sales.
the sales are on: implies that there are ongoing sales or promotions in the store, contributing to the special offer on the desk lamp.