Trade mark, compositions, color sign and discharged power
Trade Mark	Added impurity	Impurity quantity %	Other impurities %	Tungsten %	Electric discharged power	Color Sign
WZ3	ZrO2	0.2-0.4	<0.20	The rest	2.5-3.0	Brown
WZ8	ZrO2	0.7-0.9	<0.20	The rest	2.5-3.0	White

Trade mark, compositions, color sign and discharged power
Trade Mark	Added impurity	Impurity quantity %	Other impurities %	Tungsten %	Electric discharged power	Color Sign
WC20	CeO2	1.8-2.2	<0.20	The rest	2.7-2.8	Gray

Trade mark, compositions, color sign and discharged power
Trade Mark	Added impurity	Impurity quantity %	Other impurities %	Tungsten %	Electric discharged power	Color Sign
WL10	La2O3	0.8-1.2	<0.20	The rest	2.6-2.7	Black
WL15	La2O3	1.3-1.7	<0.20	The rest	2.8-3.0	Golden Yellow
WL20	La2O3	1.8-2.2	<0.20	The rest	3.8-3.2	Sky Blue