If this helps? I run my 260 at 25/28 inches at full blast from 2 weeks after transplant to harvest. I start at max dim and raise it till full power by increments thru early veg. So you have 4 lights (4 transformers) that should cover that area i believe (at the right height) call cus. Serv at HLG (they are fantastic) they can and will give you the best height for that space.
This helps a bunch. Thanks all.
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If you want more yeild try Photos instead of Autos. That plant above was 8.5 ozs. 4 photos in that space could give you ton of buds. Read up on supper cropping, scroggi g and lollipoping.
How much yeild do you want?
I intend to do photos on a scrog when I get some b spec lights. When I bought the HLG’s I didn’t understand the R and B spec thing and I ordered four r’s. I want to get two b spec lights in the future to put in between the r specs.
My 260 is an “r” and it does transplant to harvest just fine. I use an HLG65 for my seedlings till a week or so after transplant.
If you want to use the “B” boards for veg just buy them seporate and change them out for the “R” at the flip. That would drop your cost greatly. For roughly the cost of two “b” light you could turn all 4 to “b” light and then back to r’s at flip. Just change the boards out.
Using 2 “B” light would not cover the area you want to cover with the 2 b’s.
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Also you could prob get a nice discount in buying them as well. Call greg at Hlg sales he has 8 B boards referbs he can do at 50. Each. He can also give you other alternatives.
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Dont need bspec. Those you have are good start to finish. 32 inches and closer for the lights. Use that dimmer.
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You saying that R’s are okay for phots and autos? Right on
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Its all about the sectrum they give off. Rspecs have the deep red thats nessassary for flowering good buds… you’re way better off getting all Rspecs because of the full spectrum the plant needs…
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Yay… thank you all. Gonna get some dirt and get started this weakend. 
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I have the HLG350R, 260D-Kit, and UVA-30. in my 4x4.
Been running under 60% full due to heat, until now.
60% @ 15 inches above top buds, is above 70,000 LUX.
No growth stunt issues and these lights use half the power for better output, IMO.
Keeping the burples for garage heating this winter.
received this today
Good growing to you.
This clone has been in the tent for 2 months, since roots took in a clone-dome cup/ box.
11/13 On/Off lighting, avoiding heat when possible.
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Go on you app store get a light meter thers lots to choose from
Allow me to clarify the above statement.
My apology if I was misleading.
Not HLG created heat. Lung room gets sunlighted and heated daily.
June-Oct air conditioner would resolve heat and humidity allowing all year grow room.
Not sure if house can take the maximum load and learned outdoor growing this summer.
My Android App for light meter never worked. Operator error or FUBAR? Resolved with UT383-BT measuring device. Works better than phone app , too.
Good growing to all