Mars Hydro II 900W

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?

More pics.

Looking good mate, how many watts is your led?

Looks good

Buzzy74 said:

Looking good mate, how many watts is your led?

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It draws 411 watts at the wall plug.

TedeBoy said:

It draws 411 watts at the wall plug.

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Interesting because the I have did 450w and my 1600 did 671w instead of 780w like Mars stated it would do but still worked good.

i had a mars 900 (2013) drew 480 at first. a year later 520. I grew some sweet flowers w that light.