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Home-made globe diffuser/light output reducer thing?

Home-made globe diffuser/light output reducer thing?

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One of the fixtures in my apartment has been running a 9W 2700k CFL. I've been wanting to switch to a CFL of higher color temperature, but I don't have any 9W 3500k units, and I just couldn't get into using one of my 9W 4100k units. I don't know if it was the temperature, or brightness, or both, but I just didn't like it.

So, I devised a way of using one of my 13W 3500k CFLs. I lined the inside of the fixture's globe with a sheet of paper, to reduce the light output to a level I like. It actually turned out really well, and it's nice because it further diffuses the light, as well.

Of course, my biggest concern is burning/igniting the paper due to heat. So, I lined the paper such that the part of the globe above the CFL is still bare, which you can see on the left side of the photo. I've run it for an hour so far, and the paper only gets warm. With that said, does anyone think this is still a terrible idea?

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Album name:themaritimegirl / Experiments, Projects, & Mods
Keywords:Miscellaneous
File Size:245 KB
Date added:Aug 03, 2015
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Alights
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Aug 03, 2015 at 06:28 PM Author: Alights
It looks interesting tho! Like a high quality diffuse,almost like an inside frost lamp inside ..as for fire hazards maybe if it were to have a ballast fire but that's pretty rare, I have a paper postcard in my grandma's out door light with a 100W rough service lamp,and the bottom is open and the paper shield is just a few inches away and a little browned but has held up 4 months without any issues,it keeps light from shining into her window
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Aug 03, 2015 at 06:42 PM Author: Solanaceae
On my old Cooper bucket I used a cut piece of aluminum roof metal to reflect the light out into the yard and away from the house

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Aug 03, 2015 at 07:18 PM Author: LandryB
Some fiberglass cloth may diffuse the light, and have better heat resistance.
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Aug 03, 2015 at 07:54 PM Author: Ash
Without the paper igniting, with the paper in you cut in half the space of air available for convection cooling of the CFL. And CFLs dont like to be overheated like that

Id try to wrap Aluminum foil over a section of the CFL tube (the section farthest away from the base), directly on the CFL

Or you could try putting a 9W CFL ballast in the 13W one.... (but it have chance to last long enough mostly if the 9W and 13W tubes are about same length, which they likely are not)
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Aug 03, 2015 at 08:13 PM Author: themaritimegirl
How does a single sheet of paper lined against the inside of the globe cut the air space in half?

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Aug 03, 2015 at 10:18 PM Author: DetroitTwoStroke
If you wet the paper so it sticks to the glass, then let it dry, I think it would be fine.
Or, you could use something like flour paste or cornstarch paste to paint the inside of the globe with frost, but it is removable with water.

Pride and quality workmanship should lie behind manufacturing, not greed.

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Aug 04, 2015 at 01:03 AM Author: Ash
It is not right against the glass. It have to be just a bit away from it to get quite big volume trapped there

In the remaining volume, the convection is now not between the lamp and glass, but between lamp and paper. With the lower temperature difference the convection cooling is way less efficient.....
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Aug 04, 2015 at 11:47 AM Author: themaritimegirl
I see. Good point about the heat exchange now being between the lamp and the paper. The globe now indeed gets less warm than before. I've since removed more paper, so now almost the entire top of the globe is uncovered, so I'm pretty confident the lamp will be fine. We shall see. I'm glad to be able to use a 3500k lamp there now, though. I'm looking into getting some 9W 3500k CFLs online.

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