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fastfred
Old Hand



Registered: 05/17/04
Posts: 6,899
Loc: Dark side of the moon
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Re: your thoughts or suggestions on my laminar flow hood project [Re: t3chnobily]
#18072869 - 04/07/13 04:10 PM (11 years, 1 month ago) |
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I would be careful with liquids or fog. It wouldn't be too hard to get a short or shock from the high voltages involved with fluorescent lights.
For $15 it's worth having one around even if you just play around with it now and again.
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Kizzle
Misanthrope


Registered: 08/30/11
Posts: 9,866
Last seen: 2 months, 9 days
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Re: your thoughts or suggestions on my laminar flow hood project [Re: fastfred]
#18075338 - 04/08/13 03:42 AM (11 years, 1 month ago) |
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Quote:
But "LYSOL Professional Brand III Disinfectant" is $9.99 at my local MegaMart, and you can certainly reduce your disinfectant consumption significantly by letting UV do the work.
How? What do you not need to disinfect once you have the lamp?
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fastfred
Old Hand



Registered: 05/17/04
Posts: 6,899
Loc: Dark side of the moon
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Re: your thoughts or suggestions on my laminar flow hood project [Re: Kizzle]
#18075424 - 04/08/13 04:58 AM (11 years, 1 month ago) |
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Quote:
How? What do you not need to disinfect once you have the lamp?
You still have to wipe things down and use decent sterile technique. Just imagine that UV light slowly cooking everything alive in it's light. It's not going to get anything that's shadowed, or penetrate through plastic.
Using 1:10 bleach solution is dirt cheap and works the best. I just mentioned lysol because people use it and it leaves a residue.
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PussyFart
Retired Cultivation Extrodinaire



Registered: 04/08/12
Posts: 22,502
Loc: Orbiting Earth
Last seen: 2 days, 21 hours
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Re: your thoughts or suggestions on my laminar flow hood project [Re: fastfred]
#18075459 - 04/08/13 05:42 AM (11 years, 1 month ago) |
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So I googled "uv light penetrate plastic" and found this.
""""Short wave ultraviolet light (100 to 300 nm) is used to kill bacteria, hasten chemical reactions (as a catalyst), and is also valuable in the identification of certain fluorescent minerals. Unlike long wave UV, the short wave UV cannot pass through ordinary glass nor most plastics. The shortest wavelengths cannot even travel very far through the air before being absorbed by oxygen molecules as they are converted into ozone."""" http://answers.yahoo.com/question/index?qid=20090121040709AARwZGC
Then I googled "ozone health risks" and found this.
""""Studies have indicated that exposure to ground-level ozone air pollution, even at very low levels, can cause a number of respiratory health effects--particularly over time."""" http://www.sbcapcd.org/sbc/ozonehealth.htm
""""Breathing ground-level ozone can result in a number of health effects that are observed in broad segments of the population. Some of these effects include:
Induction of respiratory symptoms Decrements in lung function Inflammation of airways Respiratory symptoms can include:
Coughing Throat irritation Pain, burning, or discomfort in the chest when taking a deep breath Chest tightness, wheezing, or shortness of breath In addition to these effects, evidence from observational studies strongly indicates that higher daily ozone concentrations are associated with increased asthma attacks, increased hospital admissions, increased daily mortality, and other markers of morbidity. The consistency and coherence of the evidence for effects upon asthmatics suggests that ozone can make asthma symptoms worse and can increase sensitivity to asthma triggers."""" http://www.epa.gov/apti/ozonehealth/population.html
Now is it just me, or does this just seem unsafe to run in a home?
I personally would not want to be generating ozone all the time the bulb is running, it is killing germs sure, but it is killing me too.
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THIS HOBBY IS NOT FOR THE IMPATIENT! PLEASE BE PATIENT, DON'T BE A PATIENT! A Tale of 10 Isolates, GT Cluster Clone Monotubs, RR's Let's Grow Mushrooms DVD, SGFC(Shotgun Fruiting Chamber), Monotub Tek, Damion5050's Coir Tek, TL's Tek List, Frank's Tek List, EvilMushroom666's Pasteurization Tek, How It Should & Shouldn't Look - NEW CULTIVATORS GUIDE *** *** AFGHAN KUSH GROW LOG *** ***
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fastfred
Old Hand



Registered: 05/17/04
Posts: 6,899
Loc: Dark side of the moon
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Re: your thoughts or suggestions on my laminar flow hood project [Re: PussyFart]
#18076345 - 04/08/13 11:42 AM (11 years, 1 month ago) |
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I'm plenty familiar with ozone. And I can tell you that a 15-25W UV tube does not generate much, if any, ozone. Certainly not dangerous levels.
You get a lot more ozone out of an electrical ozone machine on the normal setting you would use it at. I'm not a proponent of breathing ozone, but ozone levels from a machine aren't particularly dangerous, and the UV light certainly doesn't come anywhere near them.
I pulled up a little quote from a corona vs. UV ozone generator site...
Quote:
Highest concentration of ozone that can be produced by 185-nm UV lamp is 0.2 percent by weight, approximately 10% of the average concentration available by corona discharge
So we're talking a different wavelength of UV light, and even then it's only 10% of what those electrical machines can produce.
You can also easily smell ozone, so there should be no problems. Even if they mixed up the bulbs you would start smelling ozone long before it became dangerous.
-FF
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PussyFart
Retired Cultivation Extrodinaire



Registered: 04/08/12
Posts: 22,502
Loc: Orbiting Earth
Last seen: 2 days, 21 hours
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Re: your thoughts or suggestions on my laminar flow hood project [Re: fastfred]
#18077615 - 04/08/13 03:42 PM (11 years, 1 month ago) |
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THIS HOBBY IS NOT FOR THE IMPATIENT! PLEASE BE PATIENT, DON'T BE A PATIENT! A Tale of 10 Isolates, GT Cluster Clone Monotubs, RR's Let's Grow Mushrooms DVD, SGFC(Shotgun Fruiting Chamber), Monotub Tek, Damion5050's Coir Tek, TL's Tek List, Frank's Tek List, EvilMushroom666's Pasteurization Tek, How It Should & Shouldn't Look - NEW CULTIVATORS GUIDE *** *** AFGHAN KUSH GROW LOG *** ***
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