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Philips 8w Tubes after 4 Months

Philips 8w Tubes after 4 Months

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These tubes were installed in August and have run on average 6 hours/day since then with typically one start per day. There is some blackening already, particularly at one end of the lower tube - although I still have confidence these tubes will have a long life!

Fitting has two Matchbox blue ballasts which are semi-instant start.

youtube_ZYYbS4AoArI.jpg IMG_0753.JPG IMG_0752.JPG youtube_tEU_drKZBeQ.jpg

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Filename:IMG_0752.JPG
Album name:sparkie / Philips
Keywords:Lamps
File Size:175 KB
Date added:Dec 29, 2013
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Date Time:2013:12:29 22:39:43
DateTime Original:2013:12:29 22:39:43
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Danny
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Dec 30, 2013 at 04:55 AM Author: Danny
HF? Yes remember my Philips TL8W/840 Experiment in the sign light? they blackened quickly aswell but I took those out after 1 year 11 months as I was bored and wanted to try some others this one http://www.lighting-gallery.net/gallery/displayimage.php?pos=-55755
arcblue
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Dec 30, 2013 at 06:03 AM Author: arcblue
What is "semi-instant start?" I'm guessing it is like one of my electronically-ballasted F4T5 fixtures that normally instant-starts the tubes, but with some lamps, they start in a glow state and then transition to a full discharge.

I'm lampin...

sparkie
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Dec 30, 2013 at 01:59 PM Author: sparkie
Semi instant means that the lamp takes about 0.5 seconds before striking unlike true instant which strikes at the exact microsecond the switch contacts close.

Also, with the Matchboxes, there is a slight preheat which you can just about see if your eyes are quick enough! It is more noticeable on some tubes more than others though.
BG101
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Brian TheTellyman
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Dec 31, 2013 at 10:13 PM Author: BG101
I noticed this too with the Matchbox units, some tubes do get a proper preheat before striking despite the spec showing these small controllers (the ones which run 6 & 8W T5s etc.) as being cold start.


BG

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