Answer: C. Lamp bead size.
Answer analysis: When discussing the lamp bead with model number "2835", we must first understand the meaning behind this model. In the naming rules of LED lamp beads, the model number is often associated with certain physical characteristics or dimensions of the lamp bead. Now, let's analyze each option one by one:
A. Lamp bead quality: The model number "2835" does not directly represent the quality of the lamp bead. Quality is an aspect of lamp bead performance, but it is not usually directly expressed by the model number.
B. Lamp bead volume: Although volume is closely related to size, in the naming of LED lamp beads, "2835" does not directly refer to volume, but more specifically describes the size of the lamp bead.
C. Lamp bead size: In the LED industry, models such as "2835" are often used to indicate the size of the lamp bead. Specifically, "28" means that the length of the lamp bead is 2.8mm (or close to this value, which may vary from manufacturer to manufacturer), and "35" means that the width of the lamp bead is 3.5mm (again, the specific value may vary slightly). This naming method allows users to intuitively understand the physical size of the lamp beads.
D. Color temperature of lamp beads: Color temperature is a measure of the color of the light source and has nothing to do with the model "2835". Color temperature is usually measured in Kelvin (K), which indicates the temperature of the black body when the color of the light source is closest to the color of the light radiated by the black body at a certain temperature.
In summary, the "2835" in the lamp bead model "2835" represents the size of the lamp bead. Therefore, the correct answer is C, lamp bead size.