Now, just purchased eight (8) Bridgelux 2750G, 560 mm strips and five (5) TRP (Thomas Research Products - Hubbell) 75 watt drivers from Digikey (for testing / prototyping) after Reading through several informative and enlightening Bridgelux Vesta 2750 discussions, received them in only two (2) days from placing the order and the prototype was built within the next two days. A perforated 18 by 26 Aluminum Sheet is used for the prototype but a solid aluminum Sheet / Bun Pan will be used for the final product...
LED Strips BXEB-2750G... https://www.digikey.com/product-detail/ ... ND/7899252
75W LED Driver... https://www.digikey.com/product-detail/ ... C3000-D-ND
100K Ohm Pot... https://www.digikey.com/product-detail/ ... ND/4733104
Perforated 18x26 Aluminum Pan... https://www.culinarydepotinc.com/winco- ... -sheet-pan
Solid 18x26 Aluminum Pan... https://www.culinarydepotinc.com/winco- ... -sheet-pan
The Vesta 2750 prototype is a modular "Supplemental" Grow light to cover a total area of 2ft x 8ft (16 sq ft / ~ 1.6 sq m) next to an East facing window. The plan is to create two to three (2 - 3) modular grow lights similar to Commercial DLC Listed Linear High Bays or a Nextlight Core. A Watt Meter (Kill A Watt P3) and Lux Meter (Benetech GM1010) will be used to measure the Lux (PPFD) and adjust / set the 100K Ohm Pots to an adequate spectrum and intensity / Density (respectively), for "Day-Neutral" plants.
Linear High Bay... https://greenlightdepot.com/collections ... 2196998187
https://cdn.shopify.com/s/files/1/0931/ ... 5685830816
@ 28000 Lm * 0.015 PPF/Lm = ~ PPF 420 (umol/s)
Nextlight Core... https://nextlight.com/index.php?route=p ... uct_id=116
@ PPF 380 (umol/s) / 0.015 PPF/Lm = ~ 25000 Lm
Using the basic sizing formulas;
Generic Lumens to PPF (PPF/Lm) Factor:
0.014 = 5000K 80 CRI
0.015 = 4000K 80 CRI
0.016 = 3000K 80 CRI
Generic "Plant PPFD Requirement":
100 - 200 PPFD (~ 6700 - 13400 Lux)= Seedlings - Cuttings (up to 24% Blue)
300 - 500 PPFD (~ 20100 - 33500 Lux) = Vegetative - Flowering (up to 20% Blue)
600 - 800+ PPFD (~ 40200 - 53600 Lux) = Fruiting / Flowering (up to 15% Blue)
Formulas;
Req'd PPFD * Area (sq m) = Req'd PPF
Req'd PPF / LED's PPF/W = Req'd Watts
We get;
Req'd PPFD 500 (umol/m2/s) * 1.6 (m2) = PPF 800 (umol/s)
800 (umol/s) / 2.1 PPF/W (132 LM/W x 0.016 PPF/Lm) = 381 Watts
Preliminary calculations for module, approximately 18 in x 24 in (40 cm x 60 cm) with eight (8) BXEB-TL-2750G 560mm strips;
a. 8 strips @ 750mA & PPF 39 (umol/s) each = 150 Watts total & PPF 312 umol/s (actual 360 umol/s @ strips)
* b. 8 strips @ 1000mA & PPF 52 (umol/s) each = 200 Watts total & PPF 416 umol/s (actual 480 umol/s @ strips)
c. 8 strips @ 1500mA & PPF 78 (umol/s) each = 300 Watts total (requires Heatsink) & PPF 624 umol/s (actual 660 umol/s @ strips)
Preliminary measurements @ 150 Watts after 2 hrs run time are;
Driver Input;
120 VAC
165 Watts
0.96 PF
Driver Output;
23.98 VDC
3.1 Amps
IR Thermometer;
25.4°C Room Temp.
35 - 37°C Rear Strip Temp.
40°C LED Driver Tc Temp.
PPFD @ center
928 umol/s/m2 @ 9 in (23 cm) - 58000 Lux
160 umol/s/m2 @ 24 in (60 cm) - 10000 Lux
References:
BXEB-2750G topic... viewtopic.php?f=15&t=761
75W LED Driver topic... viewtopic.php?f=15&t=747
EB Gen3 2700K 90CRI Performance topic... viewtopic.php?f=32&t=5575
Vesta 2750 performance topic... viewtopic.php?f=32&t=4277&hilit=bridgel ... t&start=50
DLC LIsted LED Grow Lights w/ Posted Spectrums... https://www.designlights.org/horticultu ... ng/search/
Easy Estimate of PPFD from Lux... https://www.biorxiv.org/content/biorxiv ... 0.full.pdf