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Not all black lights are the same

Not all black lights are the same

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Spiral black light works very poorly as one.
Left side shows how things fluoresce under CFL blacklight and right side under GE linear BLB.
The fluorescence photos were taken with yellow filter over the camera lens to avoid the camera from getting confused.

blacklight.jpg CIMG4932.jpg amalgamball.jpg LOAjunk.jpg

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Filename:blacklight.jpg
Album name:Luminaire / CFLs
Keywords:Lamps
File Size:77 KB
Date added:Nov 08, 2014
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rjluna2
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Robert


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Nov 08, 2014 at 11:19 AM Author: rjluna2
Probably the Woods glass are harder to produce twist tube

Pretty, please no more Chinese failure.

Medved
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Nov 08, 2014 at 01:13 PM Author: Medved
Even the linear tubes are not made of Woods glass, due to the lead use restrictions.
The reason here would be just the cheepeese production: Instead of using proper glass, they used the standard production. The reason is, the spirals need quite extensive processing on the machinery, so it is logistically quite difficult to replace it for quite small batches of the black lights. So maximum they do is to use just the special phosphor on the line and then the lacquer.
And for the filter lacquer, they use the cheapest material available (and probably use only minimum layer to keep the cost down).

No more selfballasted c***

Luminaire
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Nov 08, 2014 at 04:57 PM Author: Luminaire
The actual UV output is far too weak or it's off the spectrum. CFL doesn't make household dust light up even really close up.
Medved
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Nov 08, 2014 at 07:00 PM Author: Medved
I won't be surprised they do it the same way as colored versions: Just take a regular white CFL and dump into a color filter lacquer.
If they had switched to the rare earth phosphor since the introduction of tis "method", no wonder the UV output become none from weak...

No more selfballasted c***

dor123
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Nov 09, 2014 at 06:12 AM Author: dor123
I've an evidence in Globe-Collector x-rays photo of a blacklight MV lamp, that wood glass is lead free.

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

Medved
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Nov 09, 2014 at 06:53 AM Author: Medved
The glass itself maybe, but it is very fragile. And that needs the lead doped glass as an intermediate. There may be other design options, but those are just too costly for use in a BLB...
Therefore all makers moved to standard glass with an enamel filter. And there are many mixtures available for that use, some working well, some really cheap, but not working that good.

Definitely even without the use of Woods glass, you may make good, as well as bad black lamp.

No more selfballasted c***

Luminaire
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Nov 15, 2014 at 04:29 PM Author: Luminaire
Ok, I smashed it open. The performance was so poor that there's no loss anyways. Glass is quite transparent and bluish. Reminds me of a deep blue ashtray or a plate.
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