Lights for 12 x 12 x 18 Terrarium

[thegreenpanda]

I am going to give terrarium growing a try. I'm starting out small to see how it goes.
I will be growing mostly miniatures & seedlings. I found some t5s lights and want to see if you all think they would work.

Here's the info on them:
21 inch bulb
14w
Cool White
700 lumens
4200k
CRI 84

I bought 2 of them for my 12 x 12 x 18 terrarium and hoping they do the trick. I've been trying to find info and my head is spinning.

Do you think they would work or back to the drawing board? Any feedback would be helpful. Thanks!