6 Mar
2017
6 Mar
'17
11:11 a.m.
From: Paul Koning
>> terrible fluorescent lighting.
> There's another kind? :-)
in fact you can get LEDs that fit in fluorescent
fixtures, either as is
I've been looking for LED replacements, but I haven't seen them; I'd have
thought that that would be a pretty popular item, but I haven't seen them in
any local stores. Are they only available as an online option?
or (probably a better choice) with the ballast
removed.
Definitely - ballasts are such a pain. Actually, let me be more accurate: the
ballasts in 4' (40W) lights (where they put the two bulbs in series) are a
pain.
The new ballasts for the 8' lights (a couple of decades back, in the US,
regulations mandated a change) are actually a delight; you have to re-wire old
fixtures a bit to install them (since the new ones no longer run the lights in
series), but the upside is that 8' bulbs now either work - or don't.
This is distinctly unlike the 4' ones, where bulb X will work when paired with
bulb Y, but not when paired with bulb Z. (Because 40W bulbs are wired in
series pairs, and as they age, their characteristics change.)
I don't suppose there are ballasts for 40W bulbs that _don't_ wire them in
series?
Noel
6 Mar
6 Mar
11:17 a.m.
I have replaced all of the incandescent and CFL bulbs in my house with LED bulbs.
I have 2 full boxes of fluorescent tubes but by the time I have used them up (not
as long as some folks might think) LED replacements should be readily available
and priced well enough to change all of them, too. Oh yeah, I have also replaced
all my outdoor Christmas lights with LED as well. :-)
bill
________________________________________
From: cctalk [cctalk-bounces at classiccmp.org] on behalf of Noel Chiappa via cctalk
[cctalk at classiccmp.org]
Sent: Monday, March 6, 2017 2:11 PM
To: cctalk at classiccmp.org
Cc: jnc at mercury.lcs.mit.edu
Subject: Re: Fluorescent lights (Was: Full immersion emulation)
From: Paul Koning
>> terrible fluorescent lighting.
> There's another kind? :-)
in fact you can get LEDs that fit in fluorescent
fixtures, either as is
I've been looking for LED replacements, but I haven't seen them; I'd have
thought that that would be a pretty popular item, but I haven't seen them in
any local stores. Are they only available as an online option?
or (probably a better choice) with the ballast
removed.
Definitely - ballasts are such a pain. Actually, let me be more accurate: the
ballasts in 4' (40W) lights (where they put the two bulbs in series) are a
pain.
The new ballasts for the 8' lights (a couple of decades back, in the US,
regulations mandated a change) are actually a delight; you have to re-wire old
fixtures a bit to install them (since the new ones no longer run the lights in
series), but the upside is that 8' bulbs now either work - or don't.
This is distinctly unlike the 4' ones, where bulb X will work when paired with
bulb Y, but not when paired with bulb Z. (Because 40W bulbs are wired in
series pairs, and as they age, their characteristics change.)
I don't suppose there are ballasts for 40W bulbs that _don't_ wire them in
series?
Noel
11:20 a.m.
On Mar 6, 2017, at 2:11 PM, Noel Chiappa via cctalk
<cctalk at classiccmp.org> wrote:
The Home Depot website lists both "remove ballast" and "keep the
ballast" flavors, in stock at my local store.
A much larger selection can be found online. I've used 1000bulbs.com in the past,
good people.
paul
From: Paul Koning
>> terrible fluorescent lighting.
> There's another kind? :-)
in fact you can get LEDs that fit in fluorescent
fixtures, either as is
I've been looking for LED replacements, but I haven't seen them; I'd have
thought that that would be a pretty popular item, but I haven't seen them in
any local stores. Are they only available as an online option? 
6:57 p.m.
On Mon, Mar 06, 2017, Paul Koning via cctalk wrote:
I assume the kind of LEDs under discussion doesn't have the problem of
overheating that some LEDs have when placed in enclosures without heat
sinks, right?
--
Eric Christopherson
On Mar 6, 2017, at 2:11 PM, Noel Chiappa via
cctalk <cctalk at classiccmp.org> wrote:
The Home Depot website lists both "remove ballast" and "keep the
ballast" flavors, in stock at my local store.
A much larger selection can be found online. I've used 1000bulbs.com in the past,
good people.
paul
From: Paul Koning
>> terrible fluorescent lighting.
> There's another kind? :-)
in fact you can get LEDs that fit in fluorescent
fixtures, either as is
I've been looking for LED replacements, but I haven't seen them; I'd have
thought that that would be a pretty popular item, but I haven't seen them in
any local stores. Are they only available as an online option? 
9:01 p.m.
On 03/06/2017 08:57 PM, Eric Christopherson via cctalk wrote:
I assume the kind of LEDs under discussion doesn't have the problem of
overheating that some LEDs have when placed in enclosures without heat
sinks, right?
The 48" LED fluorescent retrofits have a lot of surface
area, so they probably do OK. The retrofits I made are
electrically isolated from the line, and have 88 square
inches of copper PC board material to act as a heat sink.
They still run quite warm, although when on, the optical
output of these things is stronger than full sunlight, so
they appear to be REALLY warm on the skin, so that fools
you. You have to test the temperature just one second after
they are turned off to get a better idea of the real
temperature.
I'm running about 19 W total into 20 1W LEDs, replacing TWO
48" tubes. Previous input to a 2-lamp ancient ballast was
103 W, the LED supply draws 21 W, as measured with a real
power meter.
Jon
11:23 a.m.
I bought 4x2 (4', 2 bulb) replacement LED fixtures on Amazon to swap out some of the
fluorescent fixtures in my shop. You can get 3 color temperatures (I got 2700k I think).
Hard-wired, but an easy install and the light is very bright. $53/per.
Rich
Sent from my iPhone
On Mar 6, 2017, at 2:11 PM, Noel Chiappa via cctalk <cctalk at classiccmp.org>
wrote:
From: Paul
Koning
>> terrible fluorescent lighting.
> There's another kind? :-)
in fact you can get LEDs that fit in fluorescent
fixtures, either as is
I've been looking for LED replacements, but I haven't seen them; I'd have
thought that that would be a pretty popular item, but I haven't seen them in
any local stores. Are they only available as an online option?
or (probably a better choice) with the ballast
removed.
Definitely - ballasts are such a pain. Actually, let me be more accurate: the
ballasts in 4' (40W) lights (where they put the two bulbs in series) are a
pain.
The new ballasts for the 8' lights (a couple of decades back, in the US,
regulations mandated a change) are actually a delight; you have to re-wire old
fixtures a bit to install them (since the new ones no longer run the lights in
series), but the upside is that 8' bulbs now either work - or don't.
This is distinctly unlike the 4' ones, where bulb X will work when paired with
bulb Y, but not when paired with bulb Z. (Because 40W bulbs are wired in
series pairs, and as they age, their characteristics change.)
I don't suppose there are ballasts for 40W bulbs that _don't_ wire them in
series?
Noel 
11:40 a.m.
On 03/06/2017 11:23 AM, Richard Cini via cctalk wrote:
I bought 4x2 (4', 2 bulb) replacement LED fixtures
on Amazon to swap
out some of the fluorescent fixtures in my shop. You can get 3 color
temperatures (I got 2700k I think). Hard-wired, but an easy install
and the light is very bright. $53/per.
I've got the T8 lights in my shop running from solid-state (GE) ballasts
that I picked up perhaps 20 years ago. When I get to the bottom of the
box, I'll probably replace the fixtures with LED ones, so any
information like this is good to know.
FWIW, they're 4-lamp fixtures (2 ballast). Replacements needn't fit
the original form factor--I suspect that there are smaller, more compact
LED fixtures with equivalent light output.
--Chuck
11:42 a.m.
On Mon, Mar 06, 2017 at 02:11:45PM -0500, Noel Chiappa via cctalk wrote:
[...]
I've been looking for LED replacements, but I
haven't seen them; I'd have
thought that that would be a pretty popular item, but I haven't seen them in
any local stores. Are they only available as an online option?
I've seen people I trust on such matters rave about Osram SubstiTUBE:
https://www.osram.com/osram_com/products/led-technology/lamps/led-tubes/
Whether they're online-only mainly comes down to how good your local shops are.
6:40 p.m.
On 03/06/2017 01:11 PM, Noel Chiappa via cctalk wrote:
I have converted our kitchen to LEDs. See :
http://pico-systems.com/Lighting.html
Not exactly cheap (the LED lighting power supplies are
pretty expensive) but they are working quite well.
Jon
in fact you
can get LEDs that fit in fluorescent fixtures, either as is
I've been looking for LED replacements, but I haven't seen them; I'd have
thought that that would be a pretty popular item, but I haven't seen them in
any local stores. Are they only available as an online option?
2847
days inactive
2848
days old
8 comments
8 participants
participants (8)
-
abuse＠cabal.org.uk -
bill.gunshannon＠hotmail.com -
cclist＠sydex.com -
echristopherson＠gmail.com -
elson＠pico-systems.com -
jnc＠mercury.lcs.mit.edu -
paulkoning＠comcast.net -
rich.cini＠verizon.net