The Tocharian B word läkutsetstse
Word läkutsetstse
l ə kʷ ts e ts ts e
IPA ləkʷtsetstse
Meaning bright

Comments
Douglas Q. Adams, “Etymological Dictionary of Tocharian B”, 1999, Brill

Other words that might be of interest
kauṃ ‘sun’, pūwar ‘fire’, taur ‘ash, dust’, pälk- ‘burn’, pälśalñe ‘burning’, wärs-2 ‘darken’, sleme ‘flame’, tsāk ‘illuminate’, parkāsaṃ ‘illumination’, korośāna ‘bright yellow’, yäp- ‘sunset’, skiyo ‘shade, shadow’, pälk ‘shine’