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Crompton 2' 40W Daylight

Crompton 2' 40W Daylight

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Crompton 2' 40W Daylight (4300K) tube made by Philips.

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Light Information

Light Information

Manufacturer:Philips
Electrical
Wattage:40W
Voltage:47V
Current:0.8A
Optical
Lumen Output:2000Lm
Color Temperature:4300K

File information

File information

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Filename:DSCF3340.JPG
Album name:SuperSix / Fluorescent Lamps
Keywords:Lamps
File Size:150 KB
Date added:Feb 02, 2015
Dimensions:2050 x 1197 pixels
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TL8W
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Feb 02, 2015 at 12:42 PM Author: TL8W
5E>>May 1975 - a rare-ish combination of this newer etch and crimped caps. Will be shielded, and is a prime candidate for lush banding.

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Danny
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Feb 02, 2015 at 12:55 PM Author: Danny
This is nice even nicer with caps like that.
rapidstart
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Jun 20, 2015 at 08:23 PM Author: rapidstart
I had never heard of 2ft 40w tubes until I saw them here in L-G.
Is there some sort of safety measure to prevent them from being accidentally installed in a 2ft 20w fitting?

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Jun 20, 2015 at 08:30 PM Author: Solanaceae
I had posted a topic about this a while ago and Medved said that it is just a regular 20w tube with more rugged electrodes. I got it to start on an f20 ballast but I had to let it flash and take the starter out at the right time.

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rapidstart
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Jun 20, 2015 at 08:52 PM Author: rapidstart
But this is 2000 lumens whereas a 20w T12 I have is listed at 1000 lumens

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Jun 21, 2015 at 11:09 AM Author: don93s
I've never had a two foot 40w T12 but I do have a 30w version grow light. I imagine both the 24" 30w and 40w are electrically similar though, with same operating voltage as a regular 20w but higher current.

My understanding is that you can substitute with two 20w choke ballasts in parallel to operate either one of these. I have a bug zapper that came like that for the high wattage U-shape UV tubes.
TL8W
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Jun 21, 2015 at 11:16 AM Author: TL8W
There is no safety measure for 40w tubes being placed in 20w circuits, or vice versa, as tubes are somewhat more tolerant than incandescent in that respect. However 40w tubes may start when new on 20w gear and then operate as 20w tubes only dimmer, will last a very long time indeed if burned 24/7, but will not be reliable starting once natured, and would thus stress ballasts. 40w gear would stress a 20w tube, the extra lamp current delivered by the ballast would gnaw away at the cathodes leaving quickly-forming heavy black marks and eol at a few hundred hours. I have seen this happen on 40w installations on London Underground.

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Jun 25, 2015 at 06:53 PM Author: rapidstart
Thanks Lee.

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