Product listings for holiday lighting use a shorthand that assumes the reader already knows it: SMD, faceted, opaque, Sun Warm White, 2900K. For an installer buying cases for a full season, that shorthand carries real consequences. A lens style decides whether a roofline sparkles or glows; a Kelvin range decides whether two warm whites sit comfortably together or clash in the middle of a gutter line.
The articles in this section explain those terms in plain language. They describe what each word refers to, how it tends to look on a finished display in daylight and after dark, and what to check before committing to cases. They do not rank brands or claim that one style is correct. The right answer depends on the property, the design and what the customer approves after seeing a sample.
Where we give concrete examples, we use the public listings at Christmas Light Supplier, because those listings print the Kelvin range next to each white and separate opaque options from standard ones. That makes them a useful reference when explaining how names map to numbers. Prices quoted in these articles carry the date they were checked.
Two habits come up throughout this section. First, record the exact product label and Kelvin range on every job sheet rather than writing a generic color. Second, keep one product and one lens style per continuous line, moving any mismatched stock to a separate feature. Both habits cost nothing and prevent the most visible mistakes in the trade. For the ordering side of these decisions, see the Logistics section, and for the power side, see Planning.
Warm white is not one color. The Kelvin number on a label separates amber-leaning whites from crisp ones, and mixing them on one roofline is one of the most visible mistakes in the trade.
Two words show up constantly in LED C9 listings. One describes how the light is made; the other describes the shape of the lens. Here is what each means for a finished roofline.