T5 4 feet x 10 set
T5 2 feet x 2 set
T5 1 foot x 2 set

assuming led, 4'=16w, 2' =8w 1'=4w
total = 160+16+8 = 184w

assume lousiest possible quality = pf0.7
assume very low voltage 240-15% = 204v

w=vxaxpf
184 = 204 x a x 0.7
a= 1.29 amps


this is like nothing.. you can add 10 more sets to the circuit before it blows.

and yes.. stop investing in t5 florocent. its obsolete and soon you cannot find the tubes anymore.

t5 florocent tends to dim pretty quickly unless you go for osram/philips tubes. the cheap electronic ballast also wont last long unless you spend big money on it.
now led prices has fallen so much it makes more sense to go led now.
led tend to last longer so no need to climb up to change the tubes, sommore is concealed ceiling.

t8 led 4' can be had for rm8/tube for no name and rm25 for philips
i use mr diy rm30 per tube and runs almost 24 hours for 2 years. the output is consistent throughout.

and yes choose t8 led instead of t5 led. more space for heat dissipation = longer life.