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if you wire a dc motor in series to leds - you will get a pulsed current and flux. even in parallel you will cause a steady changing Vf. it works, but is not desired in a constant current circuit. I like, that you want to fill up your mean well to full power - and save the money for a fan...

that problem can only ocure if your heatmanagement is insufficient and your chips run @ high current rates. if you drive a chip or a board @ ~ 10-20% of rated current, that "runaway"will not happen and with a board surface of 26cm x 13cm never ever. i sell these boards here in Germany - but...

https://www.lumen-laden.de/products/quad-board-400-leds-smd5730-200w/ can give you 20% discount - if you pm before end of the month - // > 4 boards / free shipping

i wouldn`t mix up leds and fans in a row !!! - if you want to fill up the remaining volts up to max. open circuit voltage, i recommend to add 4 x 10W chip in a warmw. spectrum, to get some reds into your 4000K led build - for blooming. Any chip with i.e. Vf = ~12V and can stand 1000mA is fine...

without soldering iron in the DIY section - you stay virgin and get lost baby - just do it for the first time ! it`s easy without burnings or breathing bad stuff into your lungs :fire:bongsmilie:clap:

It`s never recommended to drive a led chip "hard". 6 x 40W (34,1V * 1,17A @ rated current) is not enough for your size (1,3x0,9m) you should buy 10pcs. of those <<Bridgelux BXRC-40E >> to receive 400W @ 148lm/w. Driving this chip @ 1,17A you need a good(expensive) heatsink with active cooling...

you see 300 w watercooled lamp 3x50w 1800K and 3x50w 5500K water tank ~60L , 2 x 120mm/2,5w /42cfm fan --- and one of my ugliest socks i could find. For the real airflow out i can`t tell a real number - but i used one of these 120mm fans in combination with a diy corbon filter and can only...

I take a shower, switch on my washing mashine or do dishes in the kitchen... ... or isn`t it that, what you call too efficient ? I`m @ 85% e.e.--- and you ? my geyser is hot @ 40°C max. watertemp. (Tj = 45°C)...

more or less you need the same amount to vaporize water @ 30°C Compound / Boiling Point at normal pressure / Water 373.15 K, 100 °C, 212 °F Heat of vaporization 40660 (J mol−1) Heat of vaporization 2257 (J g−1) 1KWh = 3600KJ 1L of water needs ~...

1L of water need ~ 0,6KW to vaporize ...would be interesting if anybody could weigh a (bigger) plant + pot / before and after a light cycle, to get some numbers

Yes Sir - biomass, GPW - is our main interest hanging around here on riu. Driving an efficient 350w lamp over a closed sea of green or scrog can produce a lot of biomass every day on a squaremeter - specially in days when a plant reaches the full size. In one year you can have 3 grows with 9...

going as cheap as posible i would buy 2 x mean well elg-240h- (500w / 90,- US$) and 8 x led board 200w /400pcs. smd5630 / 110lm/w (US$ 5,50/ board) in asia driving them @ 25% current they reach ~140lm/w and are better choice and spread for a scrog grow. USD 134,- + wire & wagos // and after...

most of white low(70) CRI leds (~...6500K - 3500K ) lack red wavelenghts that plants need for a perfect blooming. the higher the CRI of those chips - the higher is the relative proportion of these reds inside the SPD of 3500-6500K leds range. A 1800K pink chinise chip has a ratio of ~ 1blue ...

the double you have to "weighten" the different graphs by lumens or radiant flux before you do the addition.

:clap: great brother - "artwork" (KWh) is spending the time in an advanced movement powered and multiplicated with the kiloponds of your effort :idea: as good artpieces often influates other artist creactivity - i want to tell you, that looking to your pics it´s notable that: in a sqare grow...

not at all. - I just laughed and like the zestful definition of twostrokenut to see my own lifes`creativity finding my way.

i would calculate 50wled * 0,75 = xwhid * 0,80 = 46,875w hid bulb

no i said: it´s possible to substitute a 1000w HID with 600w of LED --- and then you are able to decrease the heat amount in your grow room significantly // 800w ---> 450w of heat

you are invited ! ...dinner is served at 19:30 HID = ~80% heat efficient LED= ~75% " " inside a range of good and bad types of bulbs and chips.

i can build a 1650W led lamp and touch the leds with my tongue... but what do you expect with a wired cxb3590 @ max. current inside your fist - how many seconds can you hold ??? how many minutes to destroy the chip ? so heat management specially of leds is a main issue / as most chips die @ 150°C