The best replacement for t5 is t8.

The best alternatives to t5 are rated as following:
★★★★★  t8
★★★  metal halide
★★  t12
★★  led
★★  hps
★  t8 lighting
★  power compact
★  cfl
★  mh
★  vho
★  t8 lights
★  t5i
★  t5ho
★  compact fluorescent
★  t56
  t3i
  t8 lamps
  t8 bulbs
  led grow
  hid
  t45
  t8 lumens
  t8 fluorescent
  e2
  tx
  t6
  nv3500
  led reef
  t8 comparison
  cf
  t7
  halide
  c4
  led lighting
  t8 better
  t3
  t8 light
  palm tx

Your alternative for t5 is not listed? Suggest!
Speaking about t5, one probably shouldn't forget about led.

Other search terms related to t5 and their ratings are:
★★★★★ led
★★ led supplement
★★ ls1
★ 4.11 gears
flathead
You have in mind a companion for t5 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of t5 in all years. Click on graph for more.
t5
t8
metal halide