What to do if you have light stress in week 5 of bloom?

Blue brother

Blue brother

Well-Known Member
the light a plant recieves in an indoor grow from an led or other source for that matter can be much more intense than the light It would receive in our outdoor garden from the sun. Obviously not at its source, but who cares about the source, it’s the photons that hit the plant that matters.

In all honesty it doesn’t look like light tox, no yellowing tips, leaves don’t look like they’ve prayed in a while, no bleaching at all. Without the full run down of all ur parameters though all we can do is make educated guesses.

Here’s mine, vpd and/or fertigation.
 
M

Markshomegrown

Well-Known Member
PJ Diaz said:
I don't understand the question, but yes the spectrum look similar. Not sure what "bulbs" you are referring to.

Not all 3k or 4k lamps are the same spectrum. As an example here's spectrum charts from several CMH lamps overlayed:



Click to expand...
It's the name on the chart, 2700k 13w Philips LED bulb(1521 lumens) , look the same as the 90 cri
could they be the same light spectrum?

very happy with my homemade led, just wanted to know how good these bulbs are, the results are really good but some growers on here say they're not good, never tried a good quality led, just trying to find out if they're right.
 
PJ Diaz

PJ Diaz

Well-Known Member
Markshomegrown said:
It's the name on the chart, 2700k 13w Philips LED bulb(1521 lumens) , look the same as the 90 cri
could they be the same light spectrum?

very happy with my homemade led, just wanted to know how good these bulbs are, the results are really good but some growers on here say they're not good, never tried a good quality led, just trying to find out if they're right.
Click to expand...
The charts I posted are for CMH lamps, not LED.

The growers who told you the "2700k 13w Philips LED bulb(1521 lumens)" are not good, are correct. Simple math proves it. The spectrum may be similar, but the output is close to half.

1521 lumens / 13watts = 117 lumens/watt

In comparison, the Samsung lm301 chip spectrums I posted are rated to crank out 220 lumens/watt. Obviously that depends on how hard you drive them, but you can see the drastic difference.

You have two problems with your screw in LED. 1. They likely use low bin chips, not horticulture grade. 2. The small disposable "drivers" in the screw in bulbs are not as efficient as a quality meanwell LED driver. This is resulting in comparatively inefficient and inferior lamps.
 
M

Markshomegrown

Well-Known Member
PJ Diaz said:
The charts I posted are for CMH lamps, not LED.

The growers who told you the "2700k 13w Philips LED bulb(1521 lumens)" are not good, are correct. Simple math proves it. The spectrum may be similar, but the output is close to half.

1521 lumens / 13watts = 117 lumens/watt

In comparison, the Samsung lm301 chip spectrums I posted are rated to crank out 220 lumens/watt. Obviously that depends on how hard you drive them, but you can see the drastic difference.

You have two problems with your screw in LED. 1. They likely use low bin chips, not horticulture grade. 2. The small disposable "drivers" in the screw in bulbs are not as efficient as a quality meanwell LED driver. This is resulting in comparatively inefficient and inferior lamps.
Click to expand...
That's great, will look into these, I have built a led panel and it pulled over 600g with just under 400w,
 
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