Test cricket matches are being played since 19th century.
But, Why these test matches are not played under lights(ie, day and night matches).
It will increase the audience for test cricket and also the standard of it.
closed as not constructive by Bogdanovist, Dor Cohen, wax eagle, Sancho, Mormegil Feb 11 '13 at 12:21
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The question is very subjective. This can be asked about any rule in cricket or any other sport saying why this and not that. I can, however, speculate and attempt an answer.
Though test cricket is being played for more than a century, playing under lights regularly is only a thing of the last decade and a half. Most stadiums in all cricket playing countries started investing in infrastructure for flood light cricket only by the mid-nineties and early noughties.
Flood light cricket has its own share of limitations, so as to speak.
I can only guess that while people in charge were finding solutions and alternatives for some of the above mentioned problems, we stuck by day cricket. Now that day and night tests have been tested at county level and have been approved by the ICC, we can only wait and watch the results of whether it adds to the charm of test cricket.