WorldwideHIDCollectorUSA
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HID, LPS, and preheat fluorescents forever!!!!!!
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| I wonder if there is a way to safely operate a UV germicidal bulb such as a germicidal PL lamp or a clear linear low pressure mercury vapor lamp that fits into fluorescent fixtures?
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.
DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.
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Lumex120
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/X rated
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| You can stick it inside a glass jar as that will block out most of the UV-C.
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Xytrell
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| Virtually all household materials block UVC. Something as simple as running it with the diffuser on the fixture will prevent UV exposure, especially if the diffuser is plastic of some sort. However, this will deteriorate most plastics or other organics rapidly, and they will begin to crumble in a matter of weeks or months.
If you're attempting to irradiate something, any barrier between it and you will suffice.
It is not the substance, but the dose, that makes the poison. Keep your exposure low - a few seconds at close range. Inverse square law applies, so having it 3 meters from you instead of 0.3 meters means a reduction of not 90%, but 99%
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Medved
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| Depend what do you mean by "operate".
If just a showcase to show it running, then a box with a glass "window" is good enough.
If you really want to disinfect a room, then best is to use some kind of timer control (the timer is thebest, because it maintains the dosage consistent) or at least extension cord passing just through cracked-open door, so mainly your eyes dont get any exposure. Then of course immediately after use you should ventilate the room by open window (to get rid of the ozone; during the disinfection the ozone is better to keep in the room so it will disinfect even surfaces not directly exposed).
And make the control so it can never get activated accidentally (so disconnect from the socket immediately after use).
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WorldwideHIDCollectorUSA
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HID, LPS, and preheat fluorescents forever!!!!!!
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| Should it be safe to operate a germicidal low pressure mercury vapor lamp for fun in a fixture that uses a glass diffuser? I am interested in looking for safe ways to safely operate germicidal low pressure mercury vapor lamps because I am looking to build a multi lamp preheat linear fluorescent fixture that uses both regular fluorescent tubes and linear germicidal low pressure mercury vapor germicidal lamps and a multi lamp preheat PL-L fluorescent fixture that uses both regular PL-L fluorescent lamps and germicidal PL-L fluorescent lamps.
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.
DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.
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Medved
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| Still even when you manage to stop the UV (ordinary glass should do a good job there), you have the problem with Ozone generated within the fixture. Either it will escape through the vents, or you seal all the vents, but then things within the fixture will overheat.
So maybe only operate that display case when well ventilated outside, so the O3 wont accumulate in your room...
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sox35
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| Ozone isn't always a problem, it depends on the lamp. The Philips TUV6 lamp we have doesn't output anything in the ozone-generating region of UV, so it's fine as long as there is glass between you and it. We use a large beer glass, which works well, but then we're not trying to irradiate anything with it.
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Medved
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| Well, I've met Philips germicidal lamps (15W T8 size), labeled as "ozone free", yet they still are very "ozone-smelly" when on. For my use I don't care (I see it more as a plus - it treats areas in the shadows; and the room gets ventilated after the treatment anyway), but to breathe that, I would not trust it. Of course, I'm not sure it is really the ozone, but still I just don't trust it.
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sox35
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| Well like you, I can only speak from my own experience. I've never had any of the fluorescent-style germicidal lamps, I only have a couple of these TUV6 lamps, and I certainly can't smell any ozone from either of them.
One came from an EPROM eraser and the other was used in a school laboratory, I believe it was used for experiments with a gold leaf electroscope. I don't think ozone would have been welcome in either of those applications.
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WorldwideHIDCollectorUSA
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I am wondering if there are tube guards that I could stick germicidal linear tubes such as G30T8 or G36T8 tubes into that can block the UVC radiation but still transmit visible light. Here are the germicidal tubes that I am considering: https://www.ebay.com/itm/224663134936Are there tube guards that I can use to block the UVC radiation from these tubes in order for me to safely run them in open fixtures? Would the following polycarbonate tube guards be a safe choice for G36T8 tubes or would the UVC eventually break them down and expose me to the harmful radiation? See here: https://lightbulbsurplus.com/clear-uv-blocking-t8-fluorescent-tube-guard-4-ft-plastic-sleeve/ |
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« Last Edit: October 13, 2024, 02:44:43 PM by WorldwideHIDCollectorUSA »
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.
DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.
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RRK
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Roman
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| Just order some glass tubes of suitable internal diameter cut to proper length by the supplier. Plain silicate soft glass will attenuate 100% of UVC, borosilicate/pyrex (easier to get) may pass a little UVB, but no significant UVB in germicidal lamp spectrum.
As of polycarbonate most likely it will turn ugly yellow before starting to crack.
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Laurens
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| Indeed, get a glass cylinder, or use UV hardening glue to glue some ready made squares of glass together.
Additionally, you can use UV blocking window foil to also get rid of the 365nm UVA radiation. 365nm is fairly harmless but i have noticed that i get irritated eyes when i run my HPMV lamps without my UV shield.
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WorldwideHIDCollectorUSA
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HID, LPS, and preheat fluorescents forever!!!!!!
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| I wonder if the UV blocking window foil is effective at blocking UVC from germicidal low pressure mercury vapor tubes like the G36T8 tubes that I have mentioned earlier and whether or not I can simply wrap those tubes in that window foil in order for me to use them safely in open fluorescent fixtures where the tubes are visible.
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.
DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.
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Laurens
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| I am quite sure it will. However, the heat of the lamp can discolor it if you apply it directly to the lamp, and once applied it is quite hard to peel off.
My own glass shield with window foil is slightly discolored, because i used it with a 80w HPMV lamp, which ended up heating up the shield too much because there was only about 8mm of space between the glass and the lamp.
If you insist on using the foil directly on the lamp, i can verify it tomorrow, with UVC test cards and a germicidal lamp at work. But i don't recommend it.
For linear lamps you can buy a glass tube that you wrap in the foil.
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WorldwideHIDCollectorUSA
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HID, LPS, and preheat fluorescents forever!!!!!!
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| Should it be safe to operate germicidal tubes in fluorescent fixtures that have milk glass diffusers? I have a couple of 4 foot fixtures that have milk glass diffusers that I am considering running G36T8 tubes or G40T10 tubes inside.
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.
DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.
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