On Mon, 22 Oct 2018 22:24:15 +0000 (UTC), danny burstein
wrote:

In Clare Snyder writes:

Normally LED bulbs do require some re-wiring of the fixture.
You bypass the ballast and supply power at one end.
Wrong.

The LED tubes sold by Home Despot do NOT require rewiring - but they
DO require a functioning ballast. The fixture failed to light the
original tubes because the ballast was weak. Bad tubes can accellerate
ballast failure and bad ballasts can accellerate tube failure.

Don't be so quick.

Home Depot, and the other marketers, sell _two different_ types
of LED drop-in replacement tubes.

Here in Canada Home Despot only sells the "direct fit" units that
don't require rewiring. They only sell ONE 10-pack of 4 foot tubes in
the USA. It is from Philips - part# Model# 472910 which REQUIRES a
functional instant start T8 ballast.

I should have said THOSE LED tubes sold by Home Dspot in the USA do
not require rewiring.

They also sell, in the USA, a "retrofit kit" Model# 54296168 that
contains the required tombstones etc - made to replace T12 tubes
bypassing the ballast. Not sold in Canada because they are not legal
here.''

In the USA you can buy single and dual tube packs of both direct fit
and ballast bypass tubes.

Only ONE ten pac though - which is what the OP bpught and is what we
were talking about - - - - -

One type will, in fact, work with the legacy ballast so doesn't
require rewiring [a].

The others operate off (in this country...) 120VAC.

To use the second type you have to bypass/remove the ballasts
and hook up the 120V wiring directly to the doghouses.

I suspect the original poster got the wrong type...

Someone here pointed out that there was a third type of tube
that somehow or other could be used with both the ballasted
fixtures and the directly wired ones. I've never seen them
but hey, it's possible.

[a] my head hurts visualizing how that can work.