In Test cricket, play cannot start, is immediately suspended, or cannot restart if the on-field umpires agree the light conditions are "dangerous or unreasonable". That wording comes from section 2.8 of the International Cricket Council's Test match playing conditions, which states the decision on whether lighting is unsafe is solely down to the umpires, following consultation with the ICC match referee. Umpires are allowed to use light meters, which must be supplied by the ICC, as a guideline to determine whether light is fit for play or is improving or deteriorating. Should artificial lighting at the ground not work, rules on natural lighting and weather will apply. Once play is suspended, it is the responsibility of the match umpires to continue to monitor conditions.