So I just bought a brand new one"Grow Light Science - ProGrow 640". Switching from 2 Viparspectra XS1000 and 1 Vivosun VS1000. Did I make a good decision?
I think I did
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The inside of the tent has to be a whole lot cleaner with fewer wires. The PAR maps are impressive. If you need to run 1000 corner to corner, wall to wall it looks like it is capable of doing it.
I wish the site showed the light’s wavelength distribution and what diodes it uses. The lack of this info made me hesitant to recommend them. Do you know what diodes are used?
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The spectrum and diode info(I think) you can find is “GLS Hi- Red” spectrum
Nope nevermind no diode info.
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On the subject of new light. I finally ordered an hlg and now i hop it’s not too big for my 4x4 tents. Saw it for couple hundred less than the hlg site. I bit the bullet.
We shall see.
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Is it the Far Red Rspec? Do you have separate veg and flower tents?
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This is good light for a 4x4. Picture is misleading, fixture is about 38"x36".
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It is the far red one. I do have separate tents for seedlings, veg and flower
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@dbrn32 ok. I thought it said it was 48"
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Ok. That is much better. Thank you. No tax free shipping
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The pictures are really misleading too. The 288 boards are only like 7" wide.
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Oh no. Don’t tell me bad things. They are distributors for hlg.
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It is for shorter tents, that’s ok. Probably better than my other 6 lights. 
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There’s nothing wrong with the size of boards, they just appear larger than they are.
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Thank you again
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Oops. Don’t go away yet @dbrn32 .why is the refurbished one have less wattage than their other one?
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I don’t know for sure, but i suspect it’s either a typo of the new fr fixtures received a driver update.
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I believe the scorpion model before the far red is 600w, far red model is now 700.
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I am sure it will be great.
My HLG350R, @200watts is 50% and 50Klux at 25 inches.
Yours will be better.
Kil-a-watt meter and UT383-BT light meter utilized for numbers.
Math from HLG Calculator site supports 750 PPFD approximately.
4x4 with Vipar Spectra V1200 and HLG350R and some other required for those numbers.
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@DEEPDIVERDAVE glad to hear. I am planning on bigger tent, so it should be dandy. I have 2 sf4000, 2 mars hydro2000 and a blurple that is good for seedlings. Crazy. I should have come here first …gives me an excuse to add on. Some things are good in my 60’s lol. Thank you.