LED replacement for 48" fluorescents

All our paintings were in storage during the new build, but will soon be hung, as well as some new pieces. ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

As I said upthread,

"My opera singer daughter and I just finished an hour's work shovelling a foot of snow off the driveway and walk, in brilliant sunshine under a sky bluer than my jeans, singing Christmas hymns at the top of our lungs. Good medicine."

Doing fine, thanks. Enjoy your dirt and rocks.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net

And the desert flowers and the wildlife and the WARMTH >:-} ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142   Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

15 degrees right now, going down to 8 tonight.

It's much warmer by the water ;)

Cheers

I'm glad you like it there. It would be sort of sad if you didn't. 'Tain't my cup of tequila.

I'm comfortable in shirt sleeves at any temperature above freezing, as long as it's not windy. When it's colder than that, I put on a sweater. Heat, like noise, is harder to deal with.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net

cold. Frost quakes are being reported.

On the plus (ha!) side, it's too cold for it to snow much, and I haven't gotten a single mosquito bite. Too cold for road salt to work. The old goldie loves it in the cold- she sat outside in the powder for more than 1/2 hour and yelped at whatever she thought she saw.

I'm thinking of trying some of those LED panels that Home Depot (in the US only) sells. Only about $200 for a ~4K lumen 1' x 4' panel. Also 1' x 2' etc. Anyone got one?

(this one is 4000K, so pretty cold light).

Best regards, Spehro Pefhany

--
"it's the network..."                          "The Journey is the reward" 
speff@interlog.com             Info for manufacturers: http://www.trexon.com 
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

You must use the premix stuff. The "quick-set" is much better, though a little bit harder to use. For many applications, I find it actually easier to use. The problem with the pre-mix is that water will soften it until it's painted. If you use a sponge to smooth it, it will loosen the layers below.

I don't find sanding to be a problem, either. A drywall sanding screen with a shop vac works fine.

warmth. ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142   Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

Hey thats neat, pretty slim too. Will work down to -20c, but heavy at

11lbs

I've used both. I said a damp sponge, not one that is sopping wet. It barely softens the surface, and the material that's removed works as a very fine abrasive to smooth what's left. I've done it that way on new, unpainted drywall and left no makes on the surface paper. Sanding always left marks. You couldn't find the seams after being painted, but do it any way you want to.

--
Anyone wanting to run for any political office in the US should have to 
have a DD214, and a honorable discharge.

You're not supposed to sand the paper. If you are, you haven't feathered far enough. I will. I have a bunch (~2000ft^2 basement) to do over the next couple of years.

Yes, these LEDs are truly amazing! Nothing like the 5 mCd LEDs of old, that had a couple % efficiency. You can put you hand right in front of the LEDs and feel the optical output.

Jon

On a sunny day (Fri, 03 Jan 2014 18:50:33 -0500) it happened Spehro Pefhany wrote in :

mm, I just ordered ebay item 120913486395

72 W 30 LEDs 5 meters, 12V 6A, RGB, about 16$, free shipping. If you go to the guys shop he has controllers and remotes too.

My experience with the 5050 LEDs is that those are extremely bright. Of course some power is lost in series resistors (3 in series on 12 V). The thing is supposed to stick to whatever you want to put it on. These will run from my controller..

Flat panels are nice, but 5 meters is almost room length..... price.... I love to be able to control the color. It is an architecture decision...

On a sunny day (Fri, 03 Jan 2014 18:01:37 -0700) it happened Jim Thompson wrote in :

Got off at the wrong stop and had to walk about 2 miles (no other busses). wile walking, with just jeans and a plastic jacket, my jeans froze, probably from frozen sweat, made a cracking noise. Got the job, when I came home that night there was ice all around the flat, main water pipe had burst. :-)

Great for accent lighting, but do you really think it's practical as base lighting?

Best regards, Spehro Pefhany

--
"it's the network..."                          "The Journey is the reward" 
speff@interlog.com             Info for manufacturers: http://www.trexon.com 
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

On a sunny day (Sat, 04 Jan 2014 05:41:22 -0500) it happened Spehro Pefhany wrote in :

In the evening in the living room I have a small orange like white CFL in a fixture above where I sit to watch TV, so I get no reflections in my 46 inch Samsung. On the other end of the living room is 2 x 30W (IIRC) TL tubes above the table. Behind the curtains are those 5050 LED strips shining inwards, set to the same warm color. I want some on the ceiling. With curtains open the light strips are definitely blinding if set to full white in the evening. I also have an USB LED light on the PC that you should not really look into. So, yes, I think one or more of the 5 meter type can make a nice even light and function as main light, much better than a low hanging light with LEDs that only shines on the table.

I'd be interested in your critical evaluation. Efficiency is supposed to be lower (though 72W is a lot) and people make comments about colored shadows and reflections due to the (non) mixing of the colors.

Also, the CRI is not great. Maybe not a big deal for the sort of person that never calibrates their monitors or uses Pantone books, but, hey..

Best regards, Spehro Pefhany

--
"it's the network..."                          "The Journey is the reward" 
speff@interlog.com             Info for manufacturers: http://www.trexon.com 
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

I agree, ...to some extent. I had to do above the kitchen pantry door, where the workmanship was 'less than desired'. Using a damp sponge, I filled and smoothed, and filled and smoothed. Until bit the bullet and did 'final' sanding to get FLAT. But at least was less dust that way. Just never mastered the art of getting better than 'ok' with damp sponge [I used damp paper towels stretched over a flat sanding block and gently worked the areas. Never could get as flat as I wanted. ]

On a sunny day (Sat, 04 Jan 2014 08:50:12 -0500) it happened Spehro Pefhany wrote in :

Yes, efficiency is much lower, but hey I try to make the GlowBallWarmer :-)

The opening angle of the 5050 RGB LEDs is 60 degrees IIRC, so after a few cm things should be OK. It is 60 LEDs per meter, so spacing should be no problem either.

I have never been bothered with 'colored shadows' or the like with my strips, that I have now in use for several years.

CRI?

I have no idea what that stands for?

I tell you that if anyone here knows how to adjust a monitor it should be me. From the old BW days to CRTs to LCDs with CFL and with LEDs. I can tell you the color of the room light has next to no influence on the color that comes from your TV or monitor. But you can believe in anything you like, even if LCDs are better than CRTs as far as color goes... Or anything marketing wants to tell you. But my advice is to trust your own eyes.

Maybe I will shoot a pic-tjure tonight so you see what it looks like on my teevee with LEDs shining through the curtains. Wait an other hour and it is dark outside here.