Help me choose a Kingbrite/Meijiu light !!!

Kingbrite
1. https://www.alibaba.com/product-detail/Wholesale-650W-LED-Grow-Lights-Thai_1600201864064.html
2. https://www.alibaba.com/product-detail/Kingbrite-600W-Samsung-Lm301H-LM301B-with_62448871370.html

#1 is 650W with 301H "Full spectrum" and an "Inventronics" driver + shipping
281B - 345
301H- 440

#2 is 600W with 301H "3500K" and a "MW" driver + shipping
301H - 440

The funny thing is, 650W is the same price as the 600W one. The 650W one was recommended, but I'm not sure which one is a better choice in terms of other components like the driver or heatsink. Help?


Meijiu
F8 650W with 281B
256.99usd+shipping

Also, Meijiu is offering to sell F8 with 281B diodes for 256USD. When I searched for info, the main diff. between 301B/H and 281B is that 301B/H is more efficient with its power usage? But the light with 281B is almost half the price. How much more fficient is the 301B/H than the 281B?

Thank you so much !

growkingky69 said:

Kingbrite
1. https://www.alibaba.com/product-detail/Wholesale-650W-LED-Grow-Lights-Thai_1600201864064.html
2. https://www.alibaba.com/product-detail/Kingbrite-600W-Samsung-Lm301H-LM301B-with_62448871370.html

#1 is 650W with 301H "Full spectrum" and an "Inventronics" driver + shipping
281B - 345
301H- 440

#2 is 600W with 301H "3500K" and a "MW" driver + shipping
301H - 440

The funny thing is, 650W is the same price as the 600W one. The 650W one was recommended, but I'm not sure which one is a better choice in terms of other components like the driver or heatsink. Help?


Meijiu
F8 650W with 281B
256.99usd+shipping

Also, Meijiu is offering to sell F8 with 281B diodes for 256USD. When I searched for info, the main diff. between 301B/H and 281B is that 301B/H is more efficient with its power usage? But the light with 281B is almost half the price. How much more fficient is the 301B/H than the 281B?

Thank you so much !

Click to expand...

if I remember correctly, the luminous efficacy of the 281b is around 160-170lm/w whereas the 301b is around 220-230lm/w.

I have a 150w 281b board with 288 diodes (3000k/5000k/660). It puts out 833umol/s at 14" whereas my 110W 301b board (3000k/5000k/660/730) with 218 diodes puts out 786umol/s at 14" in the hotspot. Despite being 40w less, it puts out similar light in the hotspot and only 10-12% less in the corner of a 2x2. It will all depend on footprint, diode spacing and how hard they are driven, but those two boards are roughly the same size and have a pretty much identical footprint. Ones 40x20cm, the other is 340x240.