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Lumens, Lux, and Adding It all Up

Discussion in 'Indoor Growing' started by ceestyle, Jun 19, 2008.


    wietefras Well-Known Member

    You would need to measure the light exactly the same way every time to figure out if the light is diminishing. Not an easy thing to do.
    Skunk Baxter likes this.

    JayStrainHunts New Member

    Right This might sound extrely stupid but I am new to All this lumun stuff
    I have 12W Cfl would it be enought to start of an auto??

    Cannacat Well-Known Member

    I've tried really hard to understand all I've just read but my mind just does not work like that adn I can't work it out so I'm really sorry but I'm just going to ask.
    I have 2 600w hps lights, are they going to be enough to get my 11 white widows through flowering or should I add more? I also have a 2 lamp T5, am I going to need that in there with them too because I could really do with that to veg my new clones under while the girls are using the big lights.

    kmog33 Well-Known Member

    Depends on how big your space/ the plants are. With 2x600s you can grow 2-288 plants in a 4x8 ime depending on your grow style. 2x600s is a lot of light. 3 pounds wouldn't be too much to expect with a good yielding strain and the system dialed. 4+ once you really have your shit together.

    Sent from my iPhone using Tapatalk
    Abiqua and Cannacat like this.

    Cannacat Well-Known Member

    Hahahaha thanks so much for your quick response, you just made my day! Just did some quick maths and that'd be like a good year's worth of medicine haha :bigjoint:I can't give you the exact measurements cos it's just something we threw together and added to bit by bit, but I'm happy that the light is being fairly distributed between the girls; I do think I can improve on it further by making it more reflective in there, but I'm working on it.

    since1991 Well-Known Member

    Par meters are ideal but pricey. I have a digital footcandle meter. Iam used to lumens. Does anyone know the conversion of footcandles to lumens for this device? I assume it is x10,000???
    Abiqua likes this.

    Abiqua Well-Known Member

    since1991 and sanjuan like this.

    sanjuan Well-Known Member

    I set up my first COB grow and adjusted the luminaires for 5000 foot candles at 20 inches (as measured by a Hydrofarm digital meter).

    I turned off half the COBs for seedlings but they seemed to be stretching so I turned all the lights back on. The seedlings are now getting 3000 foot candles which I suspect is too much.

    This post is from DesertGrow89 in August:
    "Yeah start with a low light intensity, around 600-1000 foot candles for starting seedlings is great, two weeks later I like to increase it to 1500-2000, and progress to 5-6000 fc gradually."

    Does that sound about right?

    RangiSTaxi Member

    Phone lux meters work fine, download a app, google store( light metre app) many to choose from. ive used even with blurpurple led,

    veg 20000- 28000 lux any light source

    40000 lux blurple for flower

    48,000-58,000 lux HPS and cree 3590s budding at tops

    dont go over 58,000 lux, or you will get chlorophyll degradation.

    you will need a smart phone with a light sensor phone, like samsung S5 or above, clean phone lense and find the weak spots, adjust light for best even lux level across canopy.

    dont try flower below 28,000 lux on any light source results will be below average
    Last edited: Apr 5, 2017
    sanjuan likes this.

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