good morning YouTube so this is the magnifying work light that I converted from an old CFL
fixture to LEDs a number of years ago these are set up for 12-volt DC so I guess they have four
LED chips and then they have some resistors on there but you can see like here I've lost
to this one I've got one still working here's three there's a four I've got two there's just
not enough light on the thing you're working on to be able to see what's going on I've been looking
for ways to retrofit this and I think I've found a solution that wasn't available at the time that
I did these LED modules and there's actually two things I want to do one is the switch that
used to sit in here there was a push button switch I want to get that lice which working
again and then we'll also look at the light that I picked up so this was from a company called m4
LED dot-com and there's the details on it it's a 11 want works off for 12 to 24 volts so it's
it's an 8-inch Sir Klein fixture that's the same size as what used to be in here and then it just
has a DC power supply so 12 volt AC or DC and it puts out 28 to 45 volts at 240 milliamps when I
first retrofitted this you couldn't get LEDs in the round form factor and then there later
came out 120 volt there were AC powered LEDs and for a while I was thinking about getting
one of the AC powered ones and then replace the power supply but then I found this m4 LED has
one already set up so I don't need to go out and find something like this it's just ready
go I want this to be 12-volt because I'm trying to have everything in my workshop here run off
a 12-volt DC so that I can just bring in 12-volt DC from my charge controller and have everything
in here powered off of DC but yeah let's take a look at the switch first because that's the
first thing I want to tackle because I need to get the switch fixed here yes this is the the
switch that used to sit in the lamp and it had the push button that stuck up through the top of the
Lamb that toggled between on and off it's kind of a complicated switch because you've actually
got four terminals there at the time like I said this switch was broken I couldn't figure out how
it worked and I couldn't figure out how to repair it so I just left the switch out and you saw how
I just had the LEDs that I put in just hardwired with some lighter nuts but I finally figured out
what had broke on this switch and it's actually quite a clever design once you look inside so
there's a couple of different contacts in there so there's these two contacts here that's the
main power on and off and then over here there's a momentary contact that goes between these two
terminals this was set up as a starter so it had a manual starter when you push the button on the
switch while you pushed it down that contact was held closed and you would hold the button
down until the fluorescent tube struck and then when you release the button it would take the
pressure off and then it would just maintain these two contacts closed and then when you
push down again it would release and it would open these and they did it all with this little
tiny rotating thing here and I believe this is a kind of a ceramic or a hard plastic material and
it has these brass contacts around the outside and then on that side there's sort of a ratchet wheel
okay so that's how this rotating part armature or whatever you want to call it goes in there it's
got two pivot pins and what had broken was this in here had kind of chipped off and you can see
that black material I put some epoxy on there to build up the broken part and then I sanded
it down so it was smooth because this end was broken it wouldn't rotate properly so when you
pushed it down instead of rotating this piece would just push into the housing and it wouldn't
rotate that's why when I was trying to make the lamp work you would have to push the switch like
half a dozen times to try to get it to turn on and it was very frustrating so at the time I just said
get rid of the switch get rid of the fluorescent light and put in some LEDs and the way this works
this part here rotates so you can see it'll only rotate one direction yeah you can see how it it
goes that way but it won't go backwards those ratchet teeth right there actually ratchet on
this contact so this is both one of the contacts but it's also the spring-loaded thing that keeps
the ratchet from going backwards so that way this thing only rotates forward these cross pieces here
short between the two contacts here to turn it on and then the next cycle it's off so you're between
these two we've got a ratchet tooth there right next to the contact and then this ratchet tooth
is right next to a blank spot so that's how they get the / - here's the push button it has a little
finger that sticks out right here that engages the ratchet so when you push the button down
it hits that ratchet if I can hold it in there you can see how that works and it just advances
one to Thun the ratchet and then the bottom of the switch pushes on this momentary contact and that's
your starter so this lamp had no starter in it so you were supposed to push the button down and hold
it until the lamp fired and then you would let go and it would lift up and there was basically
a big tall spring in there that would push the switch open quite a clever little design I mean
this thing handle starting the lamp and then it also does on and off all from a single push
button and that was the problem right there you can see where the black epoxy repair was so this
switch would work fine in that position while the shaft was okay but then it would get into
this position where the epoxy repair is and then it would fall down into the switch housing like
that and it wouldn't work so you can see here the little repair I did there I just built up
the broken part so you can see on the end did it just fractured right here a big chunk of the shaft
came off and it just wouldn't rotate properly but anyway let's see so I need to use let's
see it's these two contacts that's my on and off these two are for the starter the momentary okay
I've got it back together you have to really get it lined up so that that little finger on
the push button engages the ratchet wheel and then you've got to crimp down the ends because
if you don't crimp these down tight the holes top of the switch moves this way and then that finger
doesn't hit the ratchet wheel so there's kind of a sideways force but I have my meter set up
so you can see I've got one push it's off there's on and then you can see the way this other one
works if I go into these two this is the momentary so actually that's interesting the starter contact
closes every time I guess it doesn't hurt anything on the fluorescent but yeah there we go so I just
need to solder a couple of wires on to these two terminals and then I can screw this back up in
the lamp and then just it check out the lamp I've got it over on the side here it gets pretty bright
and I've got my power supply set at thirteen point one volts and there's 930 milliamps of current so
that's just right at 12 watts and that's a whole heck of a lot brighter than the the old LEDs I
have in there okay so you know this thing seems to work pretty well I guess my next step is I need to
figure out where I want to put this power supply because let me show you the situation I have yes
so this is where the switch screws in the two screws and the push button sticks through the
top and then there's two wires that come up from the base and that's where the ballast used to be
for the CFL and then they just brought up the voltage for the CFL lamp was brought up through
the two wires two conductor wire so I can't really run a new wire through there and they actually run
the wire through the arm I guess the arms on the lamp holder are hollow so I'm pretty much stuck
with just two wires up here so that kind of limits me on what I can do with this power supply I think
if I do like three mounts I'll do like one here one opposite the switch and then one down here
someplace let's see one thing I wanted to check real quick from one to four thirty millimeters
diameters I just want to make like a half circle mount that you can mount on the backside and then
be able to stick it up in here I'll get these out and then I'll fashioned some mounts to fasten the
new tube to and we can put this back together and see how it works as always thanks for watching