My timer only has 2 slots to plug it in and my light has 3 .I’m wondering if you use an adapter + do you know if it’s safe? CL
no. do not use. get a 3-prong timer. the third prong is the ground.
only low watt stuff should be plugged into a two-prong. the three prongs are live / common / ground. low draw stuff can use an internal ground, and only needs two prongs, live / common, like your clock radio. anything more needs three and grounds back to circuit box. like your vacuum.
or nearly any decent grow gear.
edit : sorry mel. drooly plants. really well balanced. just a touched tipped and green.