my set up

[dirk_brijs]

one more

[SantaMonica]

As long as you can see a flow across the whole screen, it should be ok. You should attach the two layers together, so that algae does not push them apart.

[dirk_brijs]

??
like in stitching them together?

[SantaMonica]

That would work

[dirk_brijs]

For the lights would be using 2 14W CFL lights 6200K (cool daylight)
1 on each side.
Enough or not? Lower K or good?

[SantaMonica]

28 total watts is not enough for a 150 gal. Needs at least 75 watts.

And 6200K is too high. Get 2800 or 3000K.

[dirk_brijs]

OK installed 2 20W (90W) CFL 2700K with 1200lm
will install some sort of reflectors too so light is more directed towards ATS and doesnt get lost in the other direction.
Scrubber is placed into operation as of now though.
screens were stitched together.
Still have to add a valve so flow will be adjusted as now flows in too hard causing the water to skip the front part of the screen.

[SantaMonica]

No no no. 20 watts bulbs are too small. You need at least 75 watts total, not 40. Add two more 23 watt CFL warm whites (equivalent to 120 watts each bulb). This will give you about 90 total watts.

Reminder:

Quick Guideline:

0.5 actual (not equivalent) fluorescent watts per gallon MINIMUM [0.13 watts per liter].
1.0 actual (not equivalent) fluorescent watts per gallon for HIGH filtering [0.26 watts per liter].
1.0 square inches of screen per gallon, with bulbs on BOTH sides (10 x 10 = 100 square inches = 100 gal)
[1.64 square cm per liter]
2.0 square inches of screen per gallon, if vertical but lit on just ONE side. [3.28 square cm per liter]
4.0 square inches of screen per gallon, if HORIZONTAL [6.56 square cm per liter].
1.5 actual (not equivalent) fluorescent watts per gallon if HORIZONTAL [0.4 watts per liter].
18 hours of lights ON, and 6 hours of lights OFF, each day.
Flow is 24 hours, and is at least 35 gph per inch of width of screen, EVEN IF one sided [60 lph per cm].
Very rough screen made of roughed-up-like-a-cactus plastic canvas.
Clean algae off of screen every SEVEN (7) days NO MATTER WHAT YOU THINK.

[dirk_brijs]

ok so I added a new lighting design to the original screen.
Built a black acrylic light box around the original screen with 2 CFL 23W (=120W) light bulbs.
So would this be enough lights now.
Oh and yes thanks for the advise on the large ATS design ( viewtopic.php?f=3&t=800 )
I went back to the drawing board on that one and will get back to you on that one soon.
Will post pictures of this one later tonight as the battery of the camera went flat.
Attached the design drawings. (note that on the drawings the acrylic used is transparent ( for viewing right??)but in real is black for reflection inwards)

[dirk_brijs]

ok battery got loaded