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what is the question? i know which one id choose in 2018

thats correct, the fixture's "light source" (a bare bulb, when new) , generates 2100 umol, thats pretty well established. its also very well established (multiple independent test going back years), that the system level efficiency of a gavita DE is about 1.7 umol/J...

are you growing vert with a DE and no reflectors to get 2100 umol out of an HPS? pretty sure thats impossible with DE bulbs also where did they say DE hps? most peopleupgrading from HPS to LED arent using DEs. (SE) HPS system efficiency is around 1.3 umol/J and while 600W may be optimistic, its...

actually i didnt realize those were so massive and one cob per driver. you want citi 1825 or luminus cxm32 citis will top out at about 160-170W and the luminus would do 210-225W each (assuming those drivers do the usual 54V max) they may have had them turned down depending on spec of the heatsink

cxm22, 3 or 4 per driver

on voltage id rec the luminus cxm22. do those heatsinks have multiple holes for mounting chips? or if there are only 2 holes are the holes for the cobs that are there 35mm apart? 35mm is common spacing for many cob holders

hells yeah. everything looks solid, upgrade the cob chips and you'll have a state of the art rig for next to nothing

youre gonna need some serious active cooling at that wattage. driver on top of heatsink sounds impractical, usually those setups are lower wattage and passive cooling

nevermind, found this http://www.handymath.com/cgi-bin/chlorined4.cgi this was also useful https://www.permaclone.com/blogs/news/hydoponics-water-quality-and-water-treatment-a-must-read and i found the original homebrew clear rez from the calculator above, for 4L at 5ppm free chlorine i...

i mixed up some homebrew clear rez last year, fortunately i wrote 1g/gal on the bottle. If i recall, this was basically a concentrate and cant remember what the safe dosage is for cloner and/or ebb and flow res. thanks

photoinhibition short internodes 4000k 80 cri does well

most people find it to be too much blue. good supplement to make your flower lights bluer

if your going to make a thread please keep your questions in there. it doesnt do the community any good for half of he dialogue to go to messages

awful news hugs to those who knew him in real life, his wisdom and level-headed demeanor will be missed

not significantly

yup theyre about 25% more efficient than same cobs run at 50W

my bad. 25 cobs per square foot at 1W each

no budget? 9 cobs per square foot at 3-5W each

same concept. scrog is just using less plants to keep your numbers down

it gets tricky. if youre in a tent you can turn down or cycle exhaust fan but then you gotta watch humidity which can be dangerous if not monitored. on cold days a tent can get to 70-80% humidity pretty quick if the fans are on a t-stat which never cycles