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A: Each kit is engineered for a specific LEGO set number, matching that model's exact geometry and wiring channels. A kit made for one set will not fit correctly in another, even within the same theme, so always confirm the set number before ordering.

A: No. Quality LED kits use low-voltage (5V) components that generate minimal heat, and installation is clip-on or friction-fit rather than gluing or drilling. The bricks stay fully intact and the modification is reversible, which is why collectors add lighting to display and resale-conscious sets without concern.

A: Battery packs (commonly 3×AA, 3×AAA, or CR2032) offer portability with no cable to hide, but need periodic replacement. USB power suits a permanent display better, since it can run continuously from a wall adapter — though most power banks time out on such low current draw, so a wall adapter or powered hub works best for always-on lighting.