What type of lamp is used to examine the collection tubes to note differences in color?

Using a UV lamp to examine the collection tubes for differences in color is appropriate in the context of working with Green Fluorescent Protein (GFP). GFP is known for its ability to fluoresce when exposed to ultraviolet light. The excitation of GFP under UV light causes it to emit a bright green fluorescence, which allows researchers to visually assess the presence and concentration of the protein in the collection tubes by observing its specific fluorescent color.

This method is crucial for evaluating the success of purification processes, as variations in fluorescence intensity correspond to differing levels of GFP. Other types of lamps, like LED, incandescent, and fluorescent, do not provide the same excitation needed for GFP to emit its specific green fluorescence, making them ineffective for this purpose in the study of GFP.