Yet another UV thread

matman4444

matman4444

Well-Known Member
What are the other popular lights for uv if I don't want to do a whole let setup, the reptile bulbs ok or not enough to make a noticeable difference?
I don't have the room for the 4ft agromax
 
canadian1969

canadian1969

Well-Known Member
I wonder if I should run all the UV and IR on the same driver and timer. What would happen at lights out if the main whites go off, and the 280/360/660/730 all came on at the same time with the main grow light off (just for that intended 30 minutes of 730 to get your 14/10 light cycle)?
 
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Photon Flinger

Well-Known Member
FR/IR should be the last light the plant gets at the end of the light cycle. Only a few minutes is needed to put them to sleep.

UV you could run pretty much any time during the light cycle. From my experience it hasn't mattered when so much as it was amount of UV for a length of time.

Are you having success with the 14/10 schedule? I think there is mention that the FR isn't as great pushing the longer light cycle. It does wonders going lower hours though. Check your PPFD and see if you can cut your hours back to give more dark time in flower.
 
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Photon Flinger

Well-Known Member
sethimus said:
that's the problem, all the time ppl like you claim it but nobody can show it. i wonder why that is
Click to expand...

Show what? I have nothing to prove to you or anyone else but myself. You can use the information or ignore it, makes no difference.

Everyone should be running their own tests anyhow to see what works best for them. Relying on urban legend and lore doesn't make you a good gardener.
 
Abiqua

Abiqua

Well-Known Member
nfhiggs said:
The sun itself does not change - its what portions reach the ground that changes.
Click to expand...
exactly. quote where I stated the sun "changed".
albedo, humidity, gravity, tilt of the earth's axis, proximity of deserts, like Gobi / Sahara and their placement in global air current etc etc all have separate factors to be considered....I am aware and I hope it is why I mentioned it.....
 
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PurpleBuz

Well-Known Member
Abiqua said:
exactly. quote where I stated the sun "changed".
albedo, humidity, gravity, tilt of the earth's axis, proximity of deserts, like Gobi / Sahara and their placement in global air current etc etc all have separate factors to be considered....I am aware and I hope it is why I mentioned it.....
Click to expand...
y'all forgot about sunspots and solar flares ... just sayin
 
Abiqua

Abiqua

Well-Known Member
PurpleBuz said:
y'all forgot about sunspots and solar flares ... just sayin
Click to expand...
Dudes there are probably tens of reason, k, sorry I didn't elucidate on each and every one, which aren't static and change aka their parameters aren't a constant?, which was my point.

Sunspots activity this year is rumored to be driving weather off the Azores, that little island chain.
 
canadian1969

canadian1969

Well-Known Member
Photon Flinger said:
Are you having success with the 14/10 schedule? I think there is mention that the FR isn't as great pushing the longer light cycle. It does wonders going lower hours though. Check your PPFD and see if you can cut your hours back to give more dark time in flower.
Click to expand...
I haven't tried this yet, still trying to figure out how many FR/IR to buy. What you are saying is contrary to what I have been reading, being the whole idea to shave that extra 2 hours off, I have no data personally though. from my reading
the whole reason we have a 12/12 cycle is because the plant isn't changing states at lights/on/off efficiently. Even 13/11 (if possible) would still be a win.
 
canadian1969

canadian1969

Well-Known Member
So having a heatsink issue lol
Heatsink thermal dissipation. okay so i have a bunch of these...
24" long. (http://www.heatsinkusa.com/1-000-wide-extruded-aluminum-heatsink/)
Specs say:
14 deg C/W/3"
Using starboard PCBs on the LEDs from Ebay (20mm)
Using thermal adhesive tape (double sided blue stuff from ebay)

How many 3 watt LEDs do you figure I can spread across 22 " of that heatsink without having to actively cool them?
I took a crack at it with a calculator and estimating values and came up with one diode every 6 inches which doesn't seem correct.
 
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Photon Flinger

Well-Known Member
canadian1969 said:
I haven't tried this yet, still trying to figure out how many FR/IR to buy. What you are saying is contrary to what I have been reading, being the whole idea to shave that extra 2 hours off, I have no data personally though. from my reading
the whole reason we have a 12/12 cycle is because the plant isn't changing states at lights/on/off efficiently. Even 13/11 (if possible) would still be a win.
Click to expand...

Been reducing lights on time for quicker flowering. So long as we provide them enough during lights on, they benefit from the extra dark time. All about the DLI!
 
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