Reading lights - Tab 320 2021

elbolillo

After a number of our trips this summer we determined that the reading lamps needed to go. The LED lights are SO bright and weren't really useful as reading lamps. We wanted a reading lamp that was adjustable and wouldn't be so obnoxiously bright if one of us wanted to sleep while the other was reading. These fit the bill perfectly: https://www.amazon.com/gp/product/B07QXVD4HN/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Not only are they adjustable but they have a blue nightlight feature and USB ports.

webers3

Looks great, is the blue light always on?

elbolillo

webers3 said:

Looks great, is the blue light always on?

No. The blue light can be used as a night light but can be turned off.

YanniLazarus

I also installed those Iights and love love love  them.  A few "voice of experience" comments:
1. I also installed them as shown in your photo - with the blue on- off button directly under the stem for the shade. That is a really awkward spot for the switch- quite hard to reach. I reinstalled both lights with the switch on a 45 degree angle which makes them much easier to use. I'm as much a slave to symmetry as the next guy, but I do think that the switches symmetrically tilted toward the center looks fine. 
2. The 45 degree tilt also makes it easier to install the driver's side fixture... hard to get to the Allen head set screw on that side. 
3. Pay attention when installing the mounting ring. There is a raised lip which engages the Allen head screw. I'm not too embarrassed to say that I installed it wrong on one fixture and had it fall off in my hand a few trips latter! 
4. Other visible "mods"- the black foam corner guard is adhered to a light aluminum angle to keep from ruining the cabinet finish.   The picture frames have magnets to hold the front piece to the rear, so we change out our adventure pictures often. 

MarkAl

I installed a fan speed control on my Fantastic Fan, at the time I had to buy 4 to get the one I needed but figured they may come in handy. Sure enough I found the two reading lights also were too bright and installed the dimmer (Pulse Width Modulator / voltage adjuster) on those two lights and the super bright yellow porch light. They work great for lights and fan. The lights look stock but can be dimmed. The added benefit on the fan was I used a variable resistor with a switch and combined both in the existing OFF-1-2-3 position.

ChanW

Be aware that a 12v USB port can have a 'phantom draw' on the battery. The port usually draws power even if nothing is plugged into it.

If I recall, the one that I measured pulled @ 125-250mA when sitting idle.

They do make 12v USB ports that draw zero when not being used, but they're harder to find.

You could put a micro toggle-switch in line with the port wiring to control the power to it.

YanniLazarus

Interesting comment. My "Google university" research mentions phantom draw when converting ac to DC.  Is there still likely a draw with 12v power to begin with?  If so, I think I'll just geld those usb's... I'm unlikely to use them. And thanks for your observations! 

AnOldUR

I believe that a USB port installed by the reading light would convert 12V to 5V. Would there be any draw if there was no load?

edit:
Went out and did a test. With nothing plugged into the USB there was no draw through the fuse feeding it. When I plugged my phone into the USB it read about a .4 amp draw. This would lead me to say that there is no phantom draw from the USB port. Note that my cheap meter only reads one digit past the decimal point and rounds off the reading. It's possible there could be a draw of less than .05 amps.

YanniLazarus

https://www.fiberglassrv.com/forums/f95/12v-usb-outlet-82301.html has a pretty detailed description of the plusses (and mostly minuses...) of the usb port I so proudly installed in my 320.  I typically use the cigarette lighter plug near the driver's side reading light with an adapter to recharge devices, and am likely to continue to do so.  I am thinking, well, no hurry, but I probably will just disable the two usb ports that came with those lovely fixtures.

AnOldUR

After reading @YanniLazarus post, I realized that my edit above may be misleading. That measurement was taken from a 5V USB port that I installed below the reading light on the passenger side by tapping into the lights 12V feed. The factory installed 12V cigarette lighter and 5V USB port on the drivers side are fed by a different fuse/circuit. There's a small LED pilot light on that USB port, but the draw is too small to register on my meter. I got the same results there, zero amps drawn with nothing plugged in.

elbolillo

AnOldUR said:

After reading @YanniLazarus post, I realized that my edit above may be misleading. That measurement was taken from a 5V USB port that I installed below the reading light on the passenger side by tapping into the lights 12V feed. The factory installed 12V cigarette lighter and 5V USB port on the drivers side are fed by a different fuse/circuit. There's a small LED pilot light on that USB port, but the draw is too small to register on my meter. I got the same results there, zero amps drawn with nothing plugged in.

What type of meter would I use and how would I go about testing the parasitic draw of a USB port?

AnOldUR

@elbolillo this is what I used, but I'm sure there are other cheaper options. You should be able to use a low cost multi-meter.

edit to add:
I'd like this better if it had another decimal point of accuracy. The .1 amp resolution won't read very small loads.

YanniLazarus

elbolillo said:

AnOldUR said:

After reading @YanniLazarus post, I realized that my edit above may be misleading. That measurement was taken from a 5V USB port that I installed below the reading light on the passenger side by tapping into the lights 12V feed. The factory installed 12V cigarette lighter and 5V USB port on the drivers side are fed by a different fuse/circuit. There's a small LED pilot light on that USB port, but the draw is too small to register on my meter. I got the same results there, zero amps drawn with nothing plugged in.

What type of meter would I use and how would I go about testing the parasitic draw of a USB port?

Those of us with the "blue light special" would love to hear your test results! 

ChanW

Mine may have been an earlier technology, or maybe just something poorly engineered, when I tested it 5 years ago.

AnOldUR said:

I believe that a USB port installed by the reading light would convert 12V to 5V. Would there be any draw if there was no load?

edit:
Went out and did a test. With nothing plugged into the USB there was no draw through the fuse feeding it. When I plugged my phone into the USB it read about a .4 amp draw. This would lead me to say that there is no phantom draw from the USB port. Note that my cheap meter only reads one digit past the decimal point and rounds off the reading. It's possible there could be a draw of less than .05 amps.

ChanW

@elbolillo, if you have the Victron Battery Monitor you would be able to look at the current draw with and without the USB outlet connected (pull the fuse for those lights, or disconnect the wire?)...
Love that Victron Battery Monitor for diagnostics!