strip checking

[Stu]

i have 6 bridgelux BXEB-L0280Z-50E1000-C-B3 for a bonsai mother and clones will this be enough for a 280 x 650 mm grow space ?

looking at the ppf calcs

.28x.65 = 0.18 m2


1.8 * 40 PPF (Veg) = 72 PPF / 18 PPF/Strip = 4 Strips

think this will depend on height of strips from plants from my understanding and would nee to be 3-4 inches away from them

need to look at what watts to run them at have a hlg 60h 20b for them and i know it over for what i have but was what i could find at the time

dose this look correct ?

thanks in advance

Stu

[PeteR_1]

i have 6 bridgelux BXEB-L0280Z-50E1000-C-B3 for a bonsai mother and clones will this be enough for a 280 x 650 mm grow space ?

looking at the ppf calcs

.28x.65 = 0.18 m2


1.8 * 40 PPF (Veg) = 72 PPF / 18 PPF/Strip = 4 Strips

think this will depend on height of strips from plants from my understanding and would nee to be 3-4 inches away from them

need to look at what watts to run them at have a hlg 60h 20b for them and i know it over for what i have but was what i could find at the time

dose this look correct ?

thanks in advance

Stu

The numbers look good to me...
And the driver can be dimmed down for the 6 Strips @ ~ 30 Watts (50%)..,

[Stu]

@P@PeteR_1

Thanks was using your calcs for that so 30w set at wall have a sonoff POWr2 not one for measuring after driver and dose the height look ok at 3-4 inches from top ?

Thanks Stu

[PeteR_1]

Thanks was using your calcs for that so 30w set at wall have a sonoff POWr2 not one for measuring after driver and dose the height look ok at 3-4 inches from top ?
Thanks Stu

You're welcome.
At least 31 - 32 Watts from the Wall (89% driver efficiency, add 11% ~ 3 Watts to the 28 Watts for the LED), at this power for 6 Strips the LEDs should be running very "Soft" and "Cool". The distance to canopy is probably more like 6 - 8 inches, but it should be measured with a relatively accurate inexpensive Lux Meter (Digital, Silicon Diode, 0 - 200K Lux range) or a PAR meter if available. Happen to have a few Bridgelux Gen2 5000K (560mm) strips on hand, can connect three, measure at 30 watts and report back later this week...

Benetech GM1010 Lux Meter... https://www.aliexpress.com/item/3225651 ... hweb201603
Bridgelux Gen2 Datasheet... https://www.bridgelux.com/sites/default ... ev%20A.pdf
HLG-60H-20B Datasheet... https://www.meanwell.com/webapp/product ... od=HLG-60H


BTW, the Gen2 BXEB -280mm 5000K strips are ~ PPF 15 - 17 (umol/s) @ 7.0 Watts... [ 1107 Lm * 0.014 = 15.49 umol/s ]

[PeteR_1]

Three (3) Bridgelux Gen2 BXEB-560 mm, 5000K LED strips

Test Light with three (3) Bridgelux Gen2 BXEB-560 mm, 5000K strips at 32 and 67 Watts after 2 hours warm up..
Strips are mounted on ~ 76 mm (3 inch) Centers
Drop off / decrease in light intensity from center to edge of footprint (~ 300mm x 660 mm) is less than ~ 500 Lux (~ 7.0 umol/m2/s)

Preliminary measurements @ 32 Watts (Dimmed with 100K Ohm Pot);
TRP 75 Watt Driver Input;
119 VAC, 59.1 Hz, 0.27 Amps
32 Watts
PF = 0.95

Driver Output;
Vdc = 18.94
mA = 1520
Watts = 28.8

IR Thermometer;
Room T°C = 23.8°C
Strip T°C = 27.0 - 29.5°C
Driver Tc = 30.2°C

32 Watts; PPFD @ center
6" - 26000 Lux, 364 PPFD (umol/m2/s)
12" - 12,600 Lux, 176 PPFD (umol/m2/s)
24" - 4500 Lux, 63 PPFD (umol/m2/s)

Additional Measurements at 67 Watts (100%)
67 Watts; PPFD @ center
6" - 48000 Lux, 672 PPFD (umol/m2/s)
12" - 24500 Lux, 343 PPFD (umol/m2/s)
24" - 8700 Lux, 121 PPFD (umol/m2/s)

75 Watt LED Driver... https://www.digikey.com/product-detail/ ... C3000-D-ND

[Labgrown]

I just wanna know where you got the heat sink, looks like a perforated baking sheet. I have a tinny clone/veg light I built out of a 1/4 sheet pan and 5x1' strips, but this looks sweet.

[PeteR_1]

I just wanna know where you got the heat sink, looks like a perforated baking sheet. I have a tinny clone/veg light I built out of a 1/4 sheet pan and 5x1' strips, but this looks sweet.

Yes, Its an inexpensive 18 x 26 Perforated Aluminum Bun Pan from a local Restaurant Supply Store ($10.00 US), I have two (2) that are used for "speedy" prototyping.
Winco Perforated 18x26 Aluminum Pan... https://www.culinarydepotinc.com/winco- ... -sheet-pan

[Stu]

@P@PeteR_1

thanks for the reading have just got a lux meter and will take some readings from it at different distances and post them up i have been running these for 5 days and very impressed with the strips for the wattage just a thought seen that ppl run them with in 3" off the canopy so will take a reading there as well

[PeteR_1]

@P@PeteR_1

thanks for the reading have just got a lux meter and will take some readings from it at different distances and post them up i have been running these for 5 days and very impressed with the strips for the wattage just a thought seen that ppl run them with in 3" off the canopy so will take a reading there as well

You're welcome, looking forward to your info...

BTW, Am puzzled that more "Growers" are not making use of Lux Meters (Digital) to adjust the heights of their Light Fixtures, especially when using White Light Sources, their use was normal procedure / practice, measuring HID and Greenhouse Lighting for calculating DLI (Daily Light Integral) for decades. Lux measurements are directly relative to PAR PPFD (umol/m2/s) for any specific Visible Light Source, all that is needed is the conversion factor (PPF/Lm) for the specific light source, e.g., 80 CRI, 5000K White Phosphor Converted LED are 0.013 - 0.014 PPF/Lm.

Published HLG Conversion Factors;
QB 288 V2 RSpec ; 0.01549
QB 288 V2 3000K ; 0.01457
QB 288 V2 4000K ; 0.01438
QB 96 V2 Elite ; 0.01505

HLG Conversion Calculator... https://horticulturelightinggroup.com/b ... ux-to-ppfd?


Samsung Horticulture L2 Module Conversion Factor;
Horticulture L2 Module; 0.01725
[141.8 PPF / 8220 Lm = 0.01725 PPF/Lm], [159 Lm/W * 0.01725 = 2.742 PPE (umol/J)]

Samsung L2 Datasheet... https://cdn.samsung.com/led/file/resour ... ev.1.0.pdf

[Stu]

@P@PeteR_1


just took some readings 33 watts at the wall

@3" 195
@4" 175
@5" 165
@6" 155
scale x100 5000
strips spaced 80 mm apart