i thought this was interesting because it extends from 350 to 750nm.
you can see the differences between the amounts of uv and far-red.
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i thought this was interesting because it extends from 350 to 750nm.
you can see the differences between the amounts of uv and far-red.
goingrey
Well-known member
I don't get the relevance. This is from a study about what kind of light people prefer during different times of the day conducted with custom-made LED lights?
Greenpower LED Toplighting compact | Philips lighting
Philips GreenPower LED toplighting compact can shorten growth cycles, increase yields, reduce energy and enable more economic use of space. Discover our products!
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goingrey
Well-known member
Hey now this is interesting! Philips came out with a blurple in 2022? And they specifically mention medicinal cannabis as a use. 10 different spectrum versions available too? Does one of them grow short trichome stalks lol?Greenpower LED Toplighting compact | Philips lighting
Philips GreenPower LED toplighting compact can shorten growth cycles, increase yields, reduce energy and enable more economic use of space. Discover our products!www.lighting.philips.com
Philips GreenPower LED toplighting compact allows you to easily switch to LED lighting, replacing your existing HPS set-up, or building a new installation. The high light output of up to 2650 μmol/s or high efficacy of up to 3.7 μmol/J
i thought it was relevant. it's still about light ratios and how much extension in frequency you get with different color temp lamps.
these don't represent custom-made led lights, they represent color temps achieved with different ratios.
as you look at the different color temps spectral distributions you can see their ratios.
if i see a major difference in flowering with 2700k bulbs only and then possibly build a modern led array i might do a better job of choosing what ratios to use.
mars hydro and quite a few others are using combinations of different color temp white light diodes.
i think they are using 3000k and 5000k.
i'm using 2700k and 5000k. pretty close.
i've seen some beautiful flowers grown with these overlapping color temps, both mine and many others.
the 2700k white led spectral dist. is very close to a hortilux super hps.
i have grown a bunch of big heavy plants with this light.
Log In ‹ EYE Hortilux — WordPress
eyehortilux.com
and that 5000k is pretty close to a metal halide.
i hope this helps!
nice, they offer different spectral versions.Greenpower LED Toplighting compact | Philips lighting
Philips GreenPower LED toplighting compact can shorten growth cycles, increase yields, reduce energy and enable more economic use of space. Discover our products!
Philips GreenPower LED toplighting compact allows you to easily switch to LED lighting, replacing your existing HPS set-up, or building a new installation. The high light output of up to 2650 μmol/s or high efficacy of up to 3.7 μmol/J
goingrey
Well-known member
i thought it was relevant. it's still about light ratios and how much extension in frequency you get with different color temp lamps.
these don't represent custom-made led lights, they represent color temps achieved with different ratios.
as you look at the different color temps spectral distributions you can see their ratios.
if i see a major difference in flowering with 2700k bulbs only and then possibly build a modern led array i might do a better job of choosing what ratios to use.
mars hydro and quite a few others are using combinations of different color temp white light diodes.
i think they are using 3000k and 5000k.
i'm using 2700k and 5000k. pretty close.
i've seen some beautiful flowers grown with these overlapping color temps, both mine and many others.
the 2700k white led spectral dist. is very close to a hortilux super hps.
i have grown a bunch of big heavy plants with this light.
Log In ‹ EYE Hortilux — WordPress
and that 5000k is pretty close to a metal halide.
i hope this helps!
So are you saying that these two graphs are "very close", and the graph on the right applies for all LED lights with a color temperature of 2700K, not just the custom-built one they used?
if you look at the relative energy at each wavelength they are very similar in the par range, not exact. the hortilux is a 2100k.
i see the wavelength marks are not showing well but if you go to the site you can see them.
of course, it's not for all lights at 2700k. they will be slightly different depending on the manufacturers.
i showed these as something relative to think about as a flowering light or flowering color temperature.
i should have been more specific.
so i got 450nm on the 2700k graph at 25% and 460nm on the hortilux at 20%.
and 650nm at 50% on the 2700k and 640nm at 20% hortilux
the horti has more orange and the 2700k more far red but both of those are usable accessory pigments.
i will revise my statement to "similar" from very close. thank you for your help!
and 650nm at 50% on the 2700k and 640nm at 20% hortilux
the horti has more orange and the 2700k more far red but both of those are usable accessory pigments.
i will revise my statement to "similar" from very close. thank you for your help!
one thing that bugbee mentioned was that far red is not directly photosynthetic but acts as a synergistic accessory pigment.
i think maybe you could eliminate far red from a custom-built array and substitute a little more dark red at 660nm instead.
and i went back over the 2700k paper and i didn't see any reference to
'custom".
i think maybe you could eliminate far red from a custom-built array and substitute a little more dark red at 660nm instead.
and i went back over the 2700k paper and i didn't see any reference to
'custom".
Hey sorry missed this post, I use bloom booster which is just a feretilizer the first 4 weeks of flower 9/58/8 at 1/2 teaspoon to
3 gallons water but no I don not use any boosters products like budswell
Hope that helps.
Yup, i'm pretty happy with my Mars Hydro LED... it's 3000 - 3200K and 6000 - 6500K, great for veg and flower.
can you switch from veg mode to flower mode or are they simultaneous?Yup, i'm pretty happy with my Mars Hydro LED... it's 3000 - 3200K and 6000 - 6500K, great for veg and flower.
I want to try vegging again with LEDs, I liked the results very much when I used quartz based soil, I found a perfect balance between the high demend for nutrition under those LEDs, and I got big lush vibrant green plants, huge leaves, very healthy, very similar to mitsuharu
Still won't flower under them, but veg is certainly more interesting for me as time and size are crucial, you can't veg same with 250 hps vs 250 led, the led is far more superior in this conditions, wish i had the money to invest in new compact QBs instead of the panel monsters I have in storage
Still won't flower under them, but veg is certainly more interesting for me as time and size are crucial, you can't veg same with 250 hps vs 250 led, the led is far more superior in this conditions, wish i had the money to invest in new compact QBs instead of the panel monsters I have in storage
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Ca++
Well-known member
What was done in the 80s? I remember mercury lamps and sodiums. Even MH seemed very modern then. All the spectrum work was with filters and prisms. With no solid work done with cannabis. Even now we are still doing it.
Plants don't see, so the visible spectrum isn't a good guide to what they need. The incandescent is a cheap way to get deep red, the far red you spoke of, and the near IR I spoke of.
These higher reds are involved in the stretch response of cannabis plants. The 15 minute stuff is unrelated and unsupported. Though it's hard to have a far red flowering response if you don't have any far red, I'm talking shade avoidance.
In shade avoidance, the better penetration of the far reds is used to gauge shade. With a blue tilted spectrum, the far red can be almost non-existent. So the plant hardly sees red depreciation greater than far red depreciation. So doesn't stretch. This is not because of the blue, but rather the lack of far red. Though the harmful nature of blue for cannabis plants and many of their analogues could have a stunting effect. Which is really just surfacing. Last year (no, the year before) I was pointing to the analogues suggesting this about blue, but now we have actual cannabis research.
i have, intentionally, used the 5000k bulbs at very high irradiance levels (2000 umols) for long periods (18-20 hours) to see the effect myself. two week period.
on one test plant, it reduced internodal length visibly but it also caused some stunting in early veg.
at the flip, i had to remove more than normal amounts of material from the plant below the net to clean it up.
i'm still growing that plant right now and i don't think it will yield as well as it's twin sister.
one inherent problem with the sils i'm experimenting with is that they are phosphor-coated blues, no matter the color temp.
i don't think you can remove the blue spike without filters.
on the next run, in about 6 weeks i will try the approach loc dog mentioned with the fixture that has veg and flower modes.
i will veg with just the 5000k's and switch to all 2700k bulbs for flower. but i will keep the intensity down in the normal ranges.
looking at the spectral distribution i think i need to add a few dark red 660's to the array. i won't be able to do it next time but i will know more after the next grow.
vermontman's galaxy uses 152 red 630's out of 200 diodes for the brute force factor, which is 76%. then 8% 660 nm. it uses 1 percent far red 740nm. that's apparently for signaling.
i wonder if galaxy uses the 630nm so heavily because it is a less expensive diode?
does anyone have a handle on this diode price issue? do manufacturers use some diodes heavily because they're cheaper?
Yes, also far red in high nm range are really expensive due to the lettuce producers. Far red dramatically increases lettuce yield. Its also because of the demand we have in leds.
