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Thread: convereting f stop and shutter speed to lumen

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  1. November 9th, 2015, 05:55 PM #1
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    Post convereting f stop and shutter speed to lumen

    I have sen converters to do this but cant find one now I don't have a
    light meter but I have a dslr I put a white background at plant level and took a picture of it
    iso 800 f 5.6 250sec Name: DSC08299.JPG Views: 290 Size: 55.4 KBName: DSC08293.JPG Views: 286 Size: 108.6 KB

    this is using 2 t12 cool white tubes and 10 watt led red and blue only
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  2. November 10th, 2015, 09:18 AM #2
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    If you have smart phone you can download app to mesure lumens/lux. And no converting needed
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  3. November 10th, 2015, 10:08 AM #3
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    Svetlana-
    Thanks for the tip! I never even thought about a smart phone app for a light meter existed.
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  4. November 10th, 2015, 10:49 AM #4
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    no smart phone mine is dumb
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  5. November 10th, 2015, 10:53 AM #5
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    You are welcome Harvey!
    I would not think so too , i even found stud finder but did not use that one yet.
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    ---------- Post Merged at 12:00 PM ----------

    Quote Originally Posted by MICKEY View Post
    no smart phone mine is dumb
    Do you have tablet?!

    I think there are some video on YouTube how to use old fashion cameras to determine lumen/lux. I dont have one so i could not try.
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  6. November 10th, 2015, 01:05 PM #6
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    found it

    Measuring Light Intensity - First Rays LLC
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  7. November 10th, 2015, 02:47 PM #7
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    Quote Originally Posted by MICKEY View Post
    found it

    Measuring Light Intensity - First Rays LLC
    Great you found info you were looking for!

    I grow my vanda under light , i thought it will be easier for tou to compare. I have 4' 4 bulbs light fixture and its enough for my vanda to bloom. I water it everyday in morning and than in evening if i dont forget. Its doing fine. And buds getting bigger each day now.
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