Lighting Mars Hydro II 900W

[SHRED]

My first LED grow. 3'x3'x5' space.
I started them under T5 for the first 3 weeks. Now they are at a little over 4 weeks old. Northern Lights and Fast & Vast.

I have the light at 15 to 20 inches from the canopy. Is this about right?
They seem fine but just checking.
Also, do I need to add a UVB bulb or will this Mars by itself be okay?

 

[namvet25]

Very nice looking girls.Looks ike your light is right on.

 

[SHRED]

Very nice looking girls.Looks ike your light is right on.

Thanks. I've had some good beginner's luck but I'm gonna always be looking to improve. I know I need to be careful to not do too many changes. Like the saying goes, "If it ain't broke, don't fix it".

 

[SHRED]

More pics.