What's new
By:
GrowWeedEasy.com
You're browsing as a guest. Sign up to join the conversation, share your grows, and get help from thousands of fellow growers — it's free and takes less than a minute.

24 days after the switch / UVB light

johnb1963

johnb1963

New member
Hello my friends, it's been 24 days since I switched to 12/12, buds are forming, seems like all is well. what do you guys think? I have a UVB light that i'm going to start using. 2 minutes twice a day, and gradually work up to 15mins twice a day during the last two weeks. anyone out there have experience with uvb lights?
 

Attachments

  • photo94851.jpg
    photo94851.jpg
    508.7 KB · Views: 3
  • photo94852.jpg
    photo94852.jpg
    509.2 KB · Views: 3
how strong a uvb?

i left mine plugged in for hours a few times and noticed some funky mosaic patterns on fan leaves..

i don't think you can mess up with introcudcing uv spectrum.. but if you're over 10w maybe don't leave it on 24h from seedling stage.
 
expensive.. and guaranteeing 15%-30% THC increase is pretty sketchy.

some good info in links tho thanks.
 
Supplementing UVB light works. Noticed a huge difference in final product.
 

Attachments

  • photo89523.jpg
    photo89523.jpg
    2.7 MB · Views: 2
I do not have space in my cabinets for the long bulbs. Anybody tried the reptile CFL lamps? I am looking at these. Rosenthal's book mentions I can use these bulbs and keep the watts between 5% & 10% of total watts. However there is no mention of the strength or penetrating power of the bulbs he mentions. I'm looking at these. I have space for 4 lamps at the top of each 2x2 cabinet. http://www.exo-terra.com/en/products/reptile_uvb200.php
 
Those should work too. Penetration will not be so good, but neither are my t5 bulbs.
 
Last edited:
BR2K 315 LEC has a good amount of light in the UV spectrum. But I don’t believe adding a bit more would be overkill. Especially if the LEC bulb is in a hood with glass lens (which effectively blocks out some UV).
 
I have a 4 foot UV-B in a 4x4 with a 315LEC sun systems hood with glass lens. On its own, that light is a real top producer but the UV has shown to really frost up the flower and surrounding foliage. I’ve shown a few photos here that show it. And I’ve learned several growth techniques I just don’t think I’d ever change.
1. Use 100w equivalent CFL’s for seeds for the first 3 weeks.’
2. If not using leds with a supplementary UV-B. Then use a 315LEC or400-600w HPS with a supplementary UV-B
3. Use the full spectrum leds that I’d built with a supplementary UV-B

in other words, the UV-B has been a beneficial addition to the finished product. I did have a Cheap timer fail and hermie a plant. Sunburned the stem and stalk to a beet red color and made over 3000 seeds on just 1 plant. That UV-Stayed on 72 hours straight
 
Farmall said:
I have a 4 foot UV-B in a 4x4 with a 315LEC sun systems hood with glass lens. On its own, that light is a real top producer but the UV has shown to really frost up the flower and surrounding foliage. I’ve shown a few photos here that show it. And I’ve learned several growth techniques I just don’t think I’d ever change.
1. Use 100w equivalent CFL’s for seeds for the first 3 weeks.’
2. If not using leds with a supplementary UV-B. Then use a 315LEC or400-600w HPS with a supplementary UV-B
3. Use the full spectrum leds that I’d built with a supplementary UV-B

in other words, the UV-B has been a beneficial addition to the finished product. I did have a Cheap timer fail and hermie a plant. Sunburned the stem and stalk to a beet red color and made over 3000 seeds on just 1 plant. That UV-Stayed on 72 hours straight
Click to expand...

Fortunately, my Vivosun 315 LEC doesn't have any glass. I also have a COB (400 watt supposed equivalent) as well. Once I start my first grow, hopefully I'll learn whether I may benefit from an additional UV/B light.
 
thanks for the feed back my friends, I'm using an cob led light that doesn't product any uv/b, so this is the one i bought, it very powerful.it's the same one farmall noted. i read a some articles, that basically said the reptile light are useless. I've also read most all lights claiming to be full spectrum, actually do not product any uv /b, mainly just uv /A. it's just starting to catch on, so the new models that have programmable light spectrum's will include uv /b.
https://californialightworks.com/products/solarsystem-uvb
 
I myself ran the reptile UVB heating lamp, and I dont think it did anything, the plant could grow right up against it without burning, and I ran it with the lights on full time. My thought is it was a 20 dollar bill tossed out the window,,,
 
Hey, I'm curious to see if you have an update since you started using the UVB. I just got a set for my tent and they're on for the first time right now. What do you think, are you buds looking extra frosty?
 
NickyChicks Hi... I started using the uvb after flower was in place for a few weeks and let it run til harvest. Whether it’s strain related or uvb...they were significantly good. Fortunately I’ve not had that much of a problem with trichome coverage but that crop was very noticeably good.
 
You must log in or register to reply here.
Back
Top