What kind of light is this?

SaltyNuts

Platinum Member
May 1, 2001
2,398
277
126
It looks like a lot of tiny LEDs. But it gives off a VERY small amount of visible light. Like almost nothing. I *suspect* it is something related to growing plants - when I put it over my seedlings they all seem to grow towards it HARD, instead of gravitating towards a normal while LED bulb that is also shining equidistant.

Any idea what kind of bulb this is?

Thanks!!!
 

Attachments

  • 20200419_222134.jpg
    20200419_222134.jpg
    627.7 KB · Views: 23

pcgeek11

Lifer
Jun 12, 2005
22,118
4,900
136
The purple tinge make me think Ultra Violet LEDs.

That and it says Ultraviolet on the label in the picture.

 

SaltyNuts

Platinum Member
May 1, 2001
2,398
277
126
The purple tinge make me think Ultra Violet LEDs.

That and it says Ultraviolet on the label in the picture.



LOL, thanks pcgeek! So, why would it be an ultra violet LED? Plants grow good with those? Thanks!
 

IronWing

No Lifer
Jul 20, 2001
72,088
32,390
136
It mentions therapeutic lamps on the label so it looks like it is to be used in some form of quackery unless the complete label says "not for use with therapeutic lamps" which would be a good thing to say if it is putting out UV.

Edit: I guess there are a few cases where UV therapy is legit.
 

SaltyNuts

Platinum Member
May 1, 2001
2,398
277
126
It mentions therapeutic lamps on the label so it looks like it is to be used in some form of quackery unless the complete label says "not for use with therapeutic lamps" which would be a good thing to say if it is putting out UV.

Edit: I guess there are a few cases where UV therapy is legit.


Thanks IronWing! I'll see if I can get a better pic of inside text, didn't even know it was there lol. I DEFINATELY did not buy it for any therapudic reasons. Not sure what I bought it for, but not that lol.
 

pcgeek11

Lifer
Jun 12, 2005
22,118
4,900
136
LOL, thanks pcgeek! So, why would it be an ultra violet LED? Plants grow good with those? Thanks!


The sun puts out UV light which also helps plants grow................... 2 + 2 = 4.

Recent research suggests that UV light may have played a key role in the origin of life on Earth, especially the origin of RNA. In a 2017 article in the Astrophysics Journal, the authors of the study note that red dwarf stars may not emit enough UV light to start the biological processes needed for the formation of ribonucleic acid, which is necessary for all forms of life on Earth. The study also suggests this finding could help in the search for life elsewhere in the universe.

 

SaltyNuts

Platinum Member
May 1, 2001
2,398
277
126
So, that warning label was actually on the lamp, which is just some cheap lamp I bought from Wal-Mart or Amazon. The bulb is I got separately I am sure.


pcgeek11, so do you think it is UV light specifically designed for plant growth? I get that UV lights might help plants grow, but don't they get MOST of their energy from regular visible light? Just seems weird to focus solely on UV lights...

Thanks!
 

pcgeek11

Lifer
Jun 12, 2005
22,118
4,900
136
So, that warning label was actually on the lamp, which is just some cheap lamp I bought from Wal-Mart or Amazon. The bulb is I got separately I am sure.


pcgeek11, so do you think it is UV light specifically designed for plant growth? I get that UV lights might help plants grow, but don't they get MOST of their energy from regular visible light? Just seems weird to focus solely on UV lights...

Thanks!


See the link above. It is mostly discussing weed but it applies to all plants in general.

A Summary of What Light is Best For Plants?

When it comes to the full UV light spectrum, its best to stick with UV-A and UV-B varieties for your plants. As mentioned, there is no benefit of direct UV-C exposure to yourself or to your crop (although UV-C may help sterilize your grow room). If you are considering using the UV-C technique to disinfect your workspace, consider safer organic alternatives to pest control, including as integrated pest management (IPM) techniques.


Depending on the species of plant you intend to grow, there will also be a precise formula for just how much UV light you’ll need, and when you should introduce it. In some cases, UV light over prolonged periods has stunted growth. In other cases, it can enhance valuable characteristics of your crop. For example, for growing cannabis, you’ll only want to introduce UV light during the final few weeks of flower, to boost trichome development, but constant UV lighting for leafy greens tends to stunt their development.


But what about grow lights? Do artificial lights include the UV spectrum, and if so will these artificial lights help your plants grow? Modern metal halide and ceramic metal halide bulbs should all produce a low, but measurable UV spectrum of light, but so do many LEDs. So long as you are investing in modern grow light technology, the UV should be built right in. Importantly, reputable grow lights won't emit any dangerous UV-C wavelengths.

What Safety Precautions Do you Need to Take for UV Lights in the Grow Room?

It goes without saying, you should never look directly into the sun, and you should also never stare straight into a grow light. The sheer intensity can cause irreversible damage to your eyesight, and its the UV spectrum which growers should be especially wary of.


To protect yourself from UV-A and UV-B electromagnetic radiation, invest in a pair of LED and MH grow room safety glasses, or the HPS and MH variety. Your eyesight will thank you later. Interestingly, you may see brands advertising UV-C production as a selling point - but this is entirely unnecessary as grow lights never produce measurable levels of UV-C. In fact, even if you protect your eyes from UV-C exposure, you have forgotten about the dangers to your skin and face.


The bottom line on UV light boils down into two recommendations:


Explore the possibilities of UV-A and UV-B for boosting yields and valuable features of your harvest, but understand you'll need to protect your eyes and skin from prolonged exposure.


Avoid using UV-C in the grow room, especially when emitted from a grow light. Exposure to UV-C can damage your skin, eyes, and more, even after only short bursts. Your plants do not need any UV-C to flourish.