Lighting Intensity/Choices For Indoor Setup?

Do-it-yourself projects such as greenhouse or shadehouse builds and related topics.
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Ferocactus
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Joined: Fri Apr 09, 2021 8:29 pm
Location: Gresham, WI USDA Zone 4b

Re: Lighting Intensity/Choices For Indoor Setup?

Post by Ferocactus »

mikethecactusguy wrote: Sun May 16, 2021 3:48 pm 10,000 lumens at plant surface is the minimum you want to grow plants indoors. Forget about watts and amps and everything else. 12,000 lumens is shaded sun intensity. What does this mean. You have to physically measure the light that reaches your plants. If a Lamp outputs 5000 lumens that is its rating at the lamp surface. It will drop substantially 12 inches away at the plant surface. Download a light meter app for your phone and use it. Buy enough lights to get 10,000 lumens at plant surface. That is the easiest what to explain lighting.
Okay, thank you, that makes more sense.

Unfortunately, I actually don't have a mobile phone, but I could buy a lux meter; I've been indecisive about which brand to buy (my budget is under $50), and the negative reviews seem to be coming from experienced growers/photographers; as opposed to a majority of positive reviews mainly from less-experienced individuals, it seems. I've considered getting one for about a month, but I haven't made any decisions yet.

Hopefully my current light will, at best, help transition my plants to full sun outdoors; I'm really not sure, as I have no way of proving/analyzing the light's spectrum, PAR/PPFD values, etc. I just have to rely on the manufacturer's claims.
It's practically impossible to grow healthy barrel cactus species here outdoors... :(
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mikethecactusguy
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Re: Lighting Intensity/Choices For Indoor Setup?

Post by mikethecactusguy »

Why does it have to be a big deal? All you need is a meter that will give you a reading that is close. You're not doing anything that requires a high degree of accuracy. Just buy a cheap meter and work at getting the light correct for the plants.
Mike The Cactus Guy
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Ferocactus
Posts: 38
Joined: Fri Apr 09, 2021 8:29 pm
Location: Gresham, WI USDA Zone 4b

Re: Lighting Intensity/Choices For Indoor Setup?

Post by Ferocactus »

mikethecactusguy wrote: Sun May 16, 2021 11:59 pm Why does it have to be a big deal? All you need is a meter that will give you a reading that is close. You're not doing anything that requires a high degree of accuracy. Just buy a cheap meter and work at getting the light correct for the plants.
I guess I just make a big deal out of it; I want to make sure my plants have the very best, since growing them outdoors where I live is only viable for a little less than half the year. Cultivation indoors is pretty much my only long-term option where I can keep them in conditions as close to their natural environment as possible. I might just have to buy a ton more lights, depending on what the meter will read.
It's practically impossible to grow healthy barrel cactus species here outdoors... :(
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