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T8 ndi chiyaniLEDchubu chowala?"T" imayimira "tubular" (mawonekedwe a babu) ndipo nambala imasonyeza m'mimba mwake mu magawo asanu ndi atatu a inchi.T8 ili ndi mainchesi 1 (kapena 8/8 inchi), T5 ili ndi mainchesi 5/8, ndipo T12 ili ndi mainchesi 12/8 (kapena 1-1/2 inchi).