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Philips SL*18/27 Earth Light Found this at a thrift store. I thought it was magnetically ballasted but it turns out to be new enough to use a electronic ballast. It's used but still works. These were intended as a 75w incandescent replacement. Keywords: Lamps

Philips SL*18/27 Earth Light

Found this at a thrift store. I thought it was magnetically ballasted but it turns out to be new enough to use a electronic ballast. It's used but still works. These were intended as a 75w incandescent replacement.

DSC01637.jpg 20250712_200825.jpg 08_25_DSC01619.jpg DSC01059.jpg 06_25_IMG_0008.jpg
Lamp/Fixture Information
Manufacturer:Philips
Model Reference:SL*18/27 Earth Light
Lamp
Lamp Type:Self Ballasted CFL
Base:E26-Medium
Service Life:10000 hours
Electrical
Wattage:18w
Voltage:120v
Optical
Lumen Output:1100 Lumens
Colour Temperature:2700K
Physical/Production
Factory Location:Mexico
Fabrication Date:February 1991
File information
Filename:08_25_DSC01619.jpg
Album name:347vPowerlite / Lamps
Keywords:Lamps
Filesize:331 KiB
Date added:24 Aug 2025
Dimensions:3072 x 2048 pixels
Displayed:14 times
DateTime Original:2025:08:03 10:16:09
Exposure Time:1/160 sec
FNumber:f/8
File Source:Digital Still Camera
Flash:Compulsory Flash, Return light detected
Focal length:17 mm
ISO:250
Model:ILCE-6400
Software:Adobe Photoshop 21.1 (Windows)
White Balance:0
URL:https://trad-lighting.net/gallery/displayimage.php?pid=967
Favourites:Add to Favourites

Comment 1 to 4 of 4
Page: 1

Ria   [Mon 25 Aug 2025 at 11:52]
Interesting, not come across any electronic-ballasted ones of these over here Compact Fluorescent (SL)
347vPowerlite   [Mon 25 Aug 2025 at 22:11]
I guess it was easier to run the higher power tubes on a electronic ballast compared to a magnetic ballast on 120v. Most CFLs from that era were still magnetically ballasted, but usually featured lower power tubes, enough to replace a 60w incandescent but not a 75w incandescent replacement like this one.
Max   [Fri 05 Sep 2025 at 07:27]
It's feasible to run a high-power fluorescent tube on 120 V mains using a series choke ballast, but the low arc voltage will result in a high drive current that will impact the lamp's efficacy negatively. So, going electronic solves two problems in one shot: the use of a more efficient (and standardized, thus cheaper) high voltage fluorescent tube, and the reduction of ballast losses.
347vPowerlite   [Sat 06 Sep 2025 at 16:40]
Interesting! It makes sense to justify the added cost of the electronic ballast that way.

Comment 1 to 4 of 4
Page: 1