Citizen 1818 par readings

Does anyone have any details of what the par readings will be for a citizen 1818 ran at 1.4a 12 inch from canopy?

With no optics.

I have used the calculator that's available on here and it says at 1 cob per sq ft it would be 1500 ppfd approx which is what I am wanting but no measurements of how far from canopy.

1500 ppfd is with co2

Cheers

when i measure single 1818 gen 5 in free air at 12" its always tested at 620-680 ppfd. at 1 per sq ft youd expect significant sidelighting so yeah prob well up over 1000 ppfd

Is that at 1.4a?

yes.

The calculator that I've found on roll it up seems to suggest a single 1818 cob in 1 sq ft of space would be 1811 ppfd.

I take it that 1818 would be 0.5 inch from the bulb?

George2324 said:

The calculator that I've found on roll it up seems to suggest a single 1818 cob in 1 sq ft of space would be 1811 ppfd.

I take it that 1818 would be 0.5 inch from the bulb?

Click to expand...

No if you were at 1in from any cob it's going to be around 3000Ppf... But that's not a useable measurement as its only for a very small area.

George2324 said:

Is that at 1.4a?

Click to expand...

Would it make a difference if it was at 1050 mA?

George2324 said:

The calculator that I've found on roll it up seems to suggest a single 1818 cob in 1 sq ft of space would be 1811 ppfd.

I take it that 1818 would be 0.5 inch from the bulb?

Click to expand...

that would be the average ppfd if you could confine 100% of the emitted light to a 1sq ft space/so minimum 6" to cover that area with angle of light emitted from the unit, and it of course wouldnt be perfectly even