Submersible LED for phyto reactor

[firechild]

I'm looking to build a phyto reactor and would like to illuminate it internally to save space, using a linear LED. I found these but the 48cm unit is only 5.8W which I assume is not going to be powerful enough. Does anyone know of a suitable alternative that would work for a 24" or so reactor?

 

[Montiman]

The only submersible LEDs I have used are the Tunze Eco Chic which do a great job.

 

[bblumberg]

Lots of IP68 LED light bars on Amazon.