On 10/26/2018 8:38 AM, TimR wrote:
On Thursday, October 25, 2018 at 9:50:18 PM UTC-4, Clare Snyder wrote:
I find my "direct replacement" LED tubes significantly brighter than
my Deluxe Warm White 34 watt tubes. Not sure about the old 40 watt
units.

I'm not so sure. I don't have any way to actually measure but I offer the following anecdote.

I replaced two 34 watt T12 fluorescent tubes with two 17 watt LED replacement tubes, direct wired (no ballast.)

To my eyes the replacement LED looked as bright or brighter.

But that location is where I occasionally shoot a video of myself playing an instrument. The LED shines on my front, there is another older fluorescent fixture behind me. In the past video quality was good, but with the new system and everything else in the same place, the video now comes out silhouetted. The light hitting the front is apparently much less than before.

The ones I bought have been the same, LEDs brighter. The 1st LED tubes
I bought were actually glass. Has trouble with FEDEX breaking them
twice ... third time actually came through unscathed. However, I broke
one but managed to "repair" it with a plastic fluorescent bulb protector
cover. The last batch I bought were really nice; aluminum on the back
side and milky plastic front and sides. They are ballast bypass and can
be wired in any way you want. That's really nice as my original
basement and garage fixtures use shunted sockets with electronic
ballasts powering each end. Here's the Amazon link:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1