Name the model, then the missing object
LEGO's Motorised Lighthouse is set 21335. That number identifies the model, not every component inside it. If your enquiry is ‘the light is missing’, a second identification is needed before a support team can know whether you mean a building element or an electrical accessory.
The product page separately names the battery box 6380609, medium motor 6290183 and lights with cable 6238858. Those exact references make a more useful starting point for the corresponding module than a general description of a white lighthouse brick.
A moulded number may not identify the colour
LEGO's identification guide distinguishes set numbers from element and design numbers. Element IDs can be found in the parts inventory at the back of instructions; many bricks also carry a moulded design number. For an ordinary building piece, keep its colour alongside that design reference rather than assuming the moulded digits specify every version.
A clear photograph, the instruction step and the appropriate reference can describe one missing part without turning the request into an uncertain list of similar-looking pieces. Use the identifiers that actually belong to your set and instructions, not another lighthouse build found online.
Several missing pieces may be a different enquiry
If an entire group seems absent, first account for the bags: LEGO notes that more than one bag can carry the same number. Its guidance directs larger missing-parts problems to support and notes that proof of purchase may be requested.
Preparing these records helps make the question precise. It does not establish that an electrical module is available, that a replacement request qualifies, or that a specific shipment has been arranged. Those answers belong to the actual support process for the owner's set.
Sources & further reading
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