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Discussions about fluorescent, LED and other types of grow lighting for Venus Flytraps and other plants

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By Savethetrees4life
Posts:  113
Joined:  Thu Sep 09, 2021 10:26 pm
I don’t really understand this but I have 17w and 30w Feit plant lights 6-10inches above my VFTs and my plants are certainly getting nice colors my light meter says 5000-6500? at plant level which is the same it picks up from outside. Idk what it means but this is the instructions with the meter. yes there’s a topolita sunflower. I have these variables and idk what they mean. Please help lol
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By elaineo
Posts:  409
Joined:  Tue Jul 24, 2012 4:07 am
What light meter do you have? The cheaper ones are notoriously inaccurate. (I can't load any of your photos, but it's probably an issue with my computer.)
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By elaineo
Posts:  409
Joined:  Tue Jul 24, 2012 4:07 am
Savethetrees4life wrote:It’s the kind ur talking about probably lol the 15$ 4 in 1 meter from Walmart
Oh yeah, the problem with those meters is that they saturate at a fairly low light intensity. If your light meter says 5000-6500 under the lights, it's probably maxed out. You either need a more expensive light meter or a filter for the current meter (can also use a light filter that attaches to your phone).
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By MaxVft
Posts:  1026
Joined:  Sat May 08, 2021 4:17 am
elaineo wrote: Mon Oct 18, 2021 5:48 pm I can't load any of your photos, but it's probably an issue with my computer.
Right click then click 'open in New tab.'
elaineo liked this
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By Shadowtski
Posts:  4306
Joined:  Tue Mar 22, 2016 8:19 am
I grabbed a photographic light-meter app for my cellphone and use it in the INCIDENT LIGHT metering mode.
With the film speed set at asa125 and the shutter speed set to 1/125sec, then with full sunlight shining down at it, your meter reading will be f16. This is the "Sunny 16 rule"
I have a photographic light meter that measures incident light, a Sekonic L308B. I tested the accuracy against this meter and the results are close enough to be usable.

Brightness relative to full daylight:
100% = f16 (EV15)
50% = f11 (EV14)
25% = f8 (EV13)
12% = f5.6 (EV12)
6% = f4 (EV11)
3% = f2.8 (EV10)

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