The aim of this study was to investigate the effects of impregnation chemicals on the flame source combustion light intensity of the LVL obtained from combination of Oriental beech + Lombardy poplar and European oak + Lombardy poplar woods, impregnated with boron compounds (Borax (Bx), Boric acid (Ba), Bx+Ba (wt:wt 50:50%)), Imersol-aqua (Ia) and Timbercare-aqua (Ta) according to ASTM D 1413-76-99 and directions of the manufacturer. LVL samples were prepared in the form of five layers, 3 mm thickness from the beech, oak and poplar veneers bonded with Desmodur-VTKA (DVTKA) and Poly(vinyl acetate) (PvAc) adhesives, according to TS EN 386. The flame source combustion light intensity of the LVL test samples were determined according to ASTM E 16050. Consequently, the flame source combustion light intensity was the highest in oakpoplar combination, Ta and PvAc and the lowest in beech-poplar combination, Bx and DVTKA adhesive. In the interaction of the impregnation chemical, types of process and adhesive, it was the highest in beech-poplar combination + (Ba+Bx) + DVTKA (763.5 lux), but the lowest in beech-poplar combination + Ba + PVAc (582.7 lux). Accordingly, boric acid showed decreasing impact on the flame source combustion light intensity of LVL. In consequence, for places which has fire risk, usage of LVL impregnated with boric acid would be advantageous.