Halide is sealed up inside a tungsten halogen lamp. The action of the halogen allows the lamp to maintain its initial luminous flux without being blackened until the end of its service life. The quantity of halogen, if insufficient, blackens the lamp and shortens its life. If excessive, however, the halogen may affect the lamp's efficacy and service life. Although an appropriate value of quantity is consequently required, this can only be calculated by means of a great number of trial production and life tests, due to the theoretical complexity and associated factors. These tests are time consuming and expensive. The aid value is therefore often determined on the excessive side to simplify experiments, thereby avoiding any risk of blackening. We used theoretical calculation for some success to determine an optimum value. We therefore aim to improve the production technology by applying our theoretical calculations to trial production and life tests.