amount of photoinitiator and a low energy light source the printing apparatus of the present invention enables rapid curing times from 5 10 times faster than the curing times of ink compositions using conventional equipment the printing apparatus of the present invention enables print speeds which were at one time thought to be unobtainable for example in an open air printing process using a heidelberg print press and a 15 w flat excimer lamp for photocuring desirably the printed sheet output is greater than 6 000 sheets per hour more desirably the printed sheet output is greater than 8 000 sheets per hour even more desirably the printed sheet output is greater than 10 000 sheets per hour while the specification has been described in detail with respect to specific embodiments thereof it will be appreciated that those skilled in the art upon attaining an understanding of the foregoing may readily conceive of alterations to variations of and equivalents to these embodiments accordingly the scope of the present invention should be assessed as that of the appended claims and any equivalents thereto the present invention is further described by the examples which follow such examples however are not to be construed as limiting in any way either the spirit or scope of the.