In order to investigate the accuracy of total flux integration with “the abridged light distribution methods of toroidal light source” proposed by Y. Nayatani, total flux obtained by using precise light distribution method was compared with that obtained by the abridged methods for 9 circular fluorescent lamps. Results obtained are as follows;
1) The discrepancy between the two methods is about 3 % for all the 9 fluorescent lamps independently of the choice of the abridged method.
2) This discrepancy is well improved when the parameter t decreases ; where t =(tuberadius)/(radius of toroid).
3) The 3-illumination readings and the 7-illumination readings methods give fairely good agreement with the precise light distribution method. The single-illlumination reading method, however, gives less good agreement due to its insufficient measuring directions.
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