Fluorescent ballast bypass for Philips LED tubes - Query

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We should look at lux levels, not lumens.
Quite so. As I wrote ..
As I've often said, whenever I have replaced fluorescent tubes with LED ones of the same length (hence around half the "lumens", I have always found that, at least perception-wise, the illumination is at least as good ('bright') as with the fluorescent. This may in part be due to the fact that the light radiation from an LED tube is far more directional.

Yes LED tubes often don't produce as many lumens as a traditional tube, but the lux on the ground may well be the same or similar. A modern 5ft ~20w led tube will nearly always be more than bright enough to replace a 5ft 58w traditional tube
As above, that has certainly always been my experience.

Kind Regards, John
 
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We should look at lux levels, not lumens.
Yes LED tubes often don't produce as many lumens as a traditional tube, but the lux on the ground may well be the same or similar. A modern 5ft ~20w led tube will nearly always be more than bright enough to replace a 5ft 58w traditional tube
I have to disagree, A workshop where I used to build control panels had LED fitting installed on a one for one replacement basis, the old beyond it fluo fittings were dumped in the metal scrap bin, however one by one the staff recovered them and hung them from the suspended ceiling with cable ties, wire offcuts etc until nearly all were re-installed. The fitting themselves looked bright, in truth dazzling but actually dingy at lighting the work and the multiple shadows into confined spaces is terrible, in another workshop the suspended ceiling was replaced and the 4x 40W flou panels were replaced with LED panels, the same thing happened.
We have replaced hundreds of fluo fittings in commercial properties and in a number of those we have been called back to provide new flou fittings.
 
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...and an interesting sidenote to me :)
Nice photometry diagram from the datasheet, showing the blue LED at 450nm and the phosphor emmisions providing the 'white' light output.

Screenshot_20220701-101729_Adobe Acrobat.jpg

Edit: blimey I'm slow - that means it's still a fluorescent tube! ;)
 
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...and an interesting sidenote to me :)
Nice photometry diagram from the datasheet, showing the blue LED at 450nm and the phosphor emmisions providing the 'white' light output.

View attachment 273488

Edit: blimey I'm slow - that means it's still a fluorescent tube! ;)
Oh yes, a white LED has not yet been invented... Or so I understand.
 

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