In a 4-cup measuring cup, heat 4 cups water in microwave to boiling.
Place tea bags in water and let steep for 5- 10 minutes.
Pour sugar into 2 quart pitcher and pour hot tea over it.
Squeeze tea bags to get out any remaining tea; add tea to pitcher and discard bags (if they are too hot to squeeze by hand, pull them up the side of the measuring cup with the strings and press with a spoon).
Stir hot tea until sugar is dissolved.
Add 4 cups cold water and lemon juice; stir well.
Chill until very cold and serve over ice with lemon.