Upped my LED to 75%

[SHRED]

These autoflowers are 17 days old. They are on a 21/3 hr on/off light schedule.

I have my Viparspectra KS3000 LED at 24".

I was driving the light at 50% and just upped it to 75%.

They seem to be handling it.
What's your opinion?

 

[Delps8]

My advice - forget about the "KS 3000" marketing silliness.

Spend $35 on a Uni-T light meter and use that to set your PPFD/DLI levels. Growers who follow the recommended values from a manufacturer will tend to get a good crop and the Uni-T, or some other light meter, is a solid "80% solution".

There are other options, of course, but, for most growers, multiplying the number of lumens by 0.015 is more than sufficiently accurate to get you to done.

BTW, nice light and nice setup.

 

[SHRED]

My advice - forget about the "KS 3000" marketing silliness.

Spend $35 on a Uni-T light meter and use that to set your PPFD/DLI levels. Growers who follow the recommended values from a manufacturer will tend to get a good crop and the Uni-T, or some other light meter, is a solid "80% solution".

There are other options, of course, but, for most growers, multiplying the number of lumens by 0.015 is more than sufficiently accurate to get you to done.

BTW, nice light and nice setup.

Thanks for the advice.

I plan on switching to my Sun Systems 315 CMH when they start to stack on the flowers.

 

[SHRED]

...


Spend $35 on a Uni-T light meter and use that to set your PPFD/DLI levels. Growers who follow the recommended values from a manufacturer will tend to get a good crop and the Uni-T, or some other light meter, is a solid "80% solution".

There are other options, of course, but, for most growers, multiplying the number of lumens by 0.015 is more than sufficiently accurate to get you to done.

BTW, nice light and nice setup.

Just ordered one.
Thanks again.

 

[NORB YIPPLS]

These autoflowers are 17 days old. They are on a 21/3 hr on/off light schedule.

I have my Viparspectra KS3000 LED at 24".

I was driving the light at 50% and just upped it to 75%.

They seem to be handling it.
What's your opinion?View attachment 1539469View attachment 1539475

Looking good, I see u hijacked a shelf from the fridge

 

[SHRED]

Looking good, I see u hijacked a shelf from the fridge

Thanks.

It's actually a wire closet shelf.

 

[Talonxracer]

These autoflowers are 17 days old. They are on a 21/3 hr on/off light schedule.

I have my Viparspectra KS3000 LED at 24".

I was driving the light at 50% and just upped it to 75%.

They seem to be handling it.
What's your opinion?View attachment 1539469View attachment 1539475

At 21 hours and with a par of 300 you will have a DLI of approx 23, about where you want to be, step up to 400 in a week or so.

 

[SHRED]

At 21 hours and with a par of 300 you will have a DLI of approx 23, about where you want to be, step up to 400 in a week or so.
View attachment 1539530
View attachment 1539532

I am currently using the Photone app on my Galaxy S22 Ultra phone.
My UNI-T light meter has been ordered.

I calibrated the app to the Viparspectra light chart.

When I take readings on this distance and percentage of light I'm getting about 640 PPFD and 49 DLI.

That seems too high but I'm probably not that accurate.

 

[Talonxracer]

That would be too high,,,but,,, calibrating it too the viparspectra map probably isn't very accurate. I think you will be ok where you are at, just watch for drooping as lights out approachs, if any shows up turn the lights down a bit.

 

[Delps8]

I do not use Photone and recommend that growers use a light meter or a PAR meter, if the expense can be justified.

The graphic that Photone (growlightmeter.com) provides recommends light levels that are far lower than other sources, is backed-up by no research (last time I checked), and it actually flies in the face of research.

Like a lot of other growers, I hewed to conventional wisdom for my first few grows, even though I had spent a lot of time researching and reading and that information was leading me to a very different conclusion. It wasn't until about halfway through my second grow when I "got my head out of my ass" and raised my light levels. My light readings for that grow are below.

You can grow cannabis at light levels ranging from 64µmols to 800-1000µmols and, at 45mols, you'll get a good crop but there's no reason to do unless your grow environment does not allow you to give your plants more light.

Re. stepped increase - I've seen no research that indicates that approach to be optimal. Light is food to a plant. If you give it too much light, it will respond in very well known, very easily identified ways (drooping leaves is not documented as a reaction to light levels, as far as I've been able to find) so my approach has been to use my Apogee to set a light level and the…watch the plant. The second set of light values shows those figures. It is a gradual increase but is much quicker than GLM's "optimal".