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Thank you

Here is the total cost of 1 lamp 250W: (shipping to Canada included) - led boards (2 pcs of 308 ) $ US 110.00 (Canadian kijiji site) -HLG240H-C1750 driver $ US 65.00 (Onlinecomponents ) - heat sink (1/8" x 10" x 30") aluminium sheet cut to size $ US 45.00 (metaldepot ) for the...

Thank you all for your help. You made me to understand the very basic of electronics. So having 7 x 3.5 ft grow area (let say 25sqft) and running 4 of those lamps with HLG-240-C1750 drivers will give me approx. 40W/sqft ( 4 x 250.25= 1001W : 25 sqft = 40.04 ) More than happy with that :) Case...

Now you talking :) I can see the light !!! -thank you

I am not worried about coverage ,I just don't know if running boards at 320W will affect efficiency or damage them. (yes we have access to 220V in Canada , but my rooms are already wired for 120V)

I believe (as Chip Green mentioned) they should be run with over 200V for full power

Well , this HLG-320 H-C2100 has almost 320W output (319.2 W) and will cost $ 120.00 Cad -I am in Canada (thank you skoomd for arrow link) and the smaller sucker (HLG240-C1750) has 250.25 W and cost $ 80.00 (Cad) (I will need four of them -bought more boards) Running the boards at 250W will...

240 - 2100 max voltage 119V 320 - 2100 over 120.00US/piece :(

Running them hard , means going with HLG320H-C2100 driver which is twice the price of HLG240H-C1750

very important piece of information - thank you

Hello everybody. Since my electronic knowledge is very limited (mechanic by trade) I want to use forum power to answer my question: I bought 2 boards 308 pcs each of Samsung LM561C S6 leds. They are 22 s ,14 p , 2100mA max ,so they running 66V at 2100mA. I am going to wire them in series so...