LED Watts & Amps January 12, 2013, 10:48:28 am Yahoo Message Number: 136170We're just finishing up the process of converting all of our incandescent & fluorescent lights over to LEDs. In essence, we had to deal with 3 different styles of fixtures:- 1141 incandescent - BA15s socket aka bayonet base - 194 incandescent - wedge base - F15T8 fluorescent In reviewing some of the technical specifications, it appears the market is moving towards the 3 diode 5050 chip as a generic standard. While others LED configurations exist, such as the 0603 & 3528, they seem like they are becoming less prevalent in the lighting market. What I found interesting is that each of the different LED chip configurations come with listed watts, which makes it easy to calculate amps. And, in the case of cutting custom strips for the fluorescent lamps, one can both design the lamp for light & power usage (amps). For the 1141 cabinet lights, I bought these older style 0603 LEDs that consume .05w per diode, or 1.8w for 36 diodes. This translates to a total of .15 amps for each of my six cabinet lights.www.amazon.com/gp/product/B008XB9BJY/ (As Andy and others have noted, warm white is 3,000K, whereas cool white is north of 5,000K.) For the 194 lights, I followed Andy's lead and got replacement step/nightlights from this outfit: http://www.superbrightleds.com/moreinfo/led-vehicle-replacement-bulbs/2-smd-led-license-plate-light/250/If you follow the link, you can see that each unit has 2 5050 LEDs pulling a total of .5w, or .25w per LED. Since each 5050 LED diode draws .08w, this equals .24+w per chip or .48-.5w for the unit. As a result, .5w/12v equals .04 amps. Originally, I bought a couple of these 194 replacement LEDs, but they didn't fit in the housings. Instead, I decided to use one in the range hood light as a replacement for the 912 (wedge):www.amazon.com/gp/product/B005CGZ5HU/ Again, while they don't list any specs, you can see small 3 diodes per chip, which could mean 3528. This is confirmed by dividing the 1w total draw by 15 diodes, which is in the .067w/diode range, or .20w per 3528 chip (5 total). Total amps are then .08 for the hood light. Last, but certainly not least, we have the fluorescent fixtures. Now, not only can one experiment with both warm white, cool white or various combinations, but you can also design the LED replacement for total watts/amps. Like others, I bought one reel (5m - 16.4') each of cool & warm white 5050 LED strips off eBay for $15 per reeel. Each reel comes with 300 chips or 72 watts (300 x .24w) total. In my case, I used two strips of 24 LEDs (approx 16" long) that each draw 5.76w or .48 amps; combined, the two strips use .96 amps. I used these two strip versions in the back lounge, "hallway" & overhead bin where the lighting is more for mood & effect. For the high-use dinette & kitchen area, I went with 3 strips (2 cool + 1 warm), that each draw 1.44 amps. (.48 per strip x 3) Compared to the old 18.5w/1.4 amp bayonet bulbs, and the 30w/2.5 amp fluorescent lamps, it's readily apparent that the LEDs draw significantly less juice. Quality of light of course is subjective, but if you're interested in really dialing in low-energy consumption, LEDs seem to be a key part of the equation.Karl 1993 22' MP As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Re: LED Watts & Amps Reply #1 – January 12, 2013, 12:59:59 pm Yahoo Message Number: 136172My SOB had a wedge based lamp for the range hood. It wasn't very bright, and it didn't cover the range top very well. I replaced with this board mounted LED unit costing $4: Amazon.com: 48 SMD White LED Light Panel T10 Festoon BA9S Dome 12V: Home Improvement http://www.amazon.com/gp/product/B008H08LQU/ref=oh_details_o03_s00_i00> It is so bright and the illumination so even across the entire area, I'd be willing to pay $40 for it! It was easily mounted on the flat plastic diffuser in the range hood, using some double sticky foam tape and small spacers to hold it off the diffuser by about 1/8" (allows air to circulate to cool the LEDs). It has adapters for the wedge base. If you don't like cool white, this warm white board works just as well, but doesn't have the adapter for the wedge base. ZITRADES BA15s Bayonet Base 9 LEDs SMD LED Bulb Warm White for 1141 1156 1073 1093 1129 Replacement, BA15s+rectangle PCB, 9-SMD5050 LED, warm white, 10-30V DC : Amazon.com : Automotive http://www.amazon.com/gp/product/B008HE0SVC/ref=oh_details_o05_s00_i00> You can probably find a warm white board that does have the wedge base.Eric Greenwell As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Re: LED Watts & Amps Reply #2 – January 12, 2013, 06:38:51 pm Yahoo Message Number: 136178Excellent! What's really cool is that it appears LED mounting media are becoming standardized. Once you can select any type/arrangement of LEDs, and then connect them to whatever socket you prefer, the sky really is the limit in terms of mixing & matching.K
Re: LED Watts & Amps Reply #3 – January 13, 2013, 03:54:54 pm Yahoo Message Number: 136189Thanks for the tip on the multi-adaptable LED arrays, Eric! I ordered a couple just to play around with. I may end up putting them in my Honda Fit.Andy Baird http://www.andybaird.com/travels/
Re: LED Watts & Amps Reply #4 – January 13, 2013, 10:32:41 pm Yahoo Message Number: 136194Automotive use for interior lights is a common use, according to the reviews and some threads I've read. Much brighter and more pleasing than the original bulbs, they say.Eric Greenwell
Re: LED Watts & Amps Reply #5 – January 14, 2013, 01:35:55 am Yahoo Message Number: 136203"Sun Jan 13, 2013 8:32 pm (PST) . Posted by:"Eric Greenwell" sewingstuff1 Automotive use for interior lights is a common use, according to the reviews and some threads I've read. Much brighter and more pleasing than the original bulbs, they say.Eric Greenwell"This is what I used for most of the incandescent fixtures: http://www.ebay.com/itm/160889326349?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649This particular seller did a good job of delivering in a reasonable time, and 20 of them for $34 ain't bad. I used multiple boards in most of the fixtures.bumper[Non-text portions of this message have been removed]
Re: LED Watts & Amps Reply #6 – January 14, 2013, 10:55:24 am Yahoo Message Number: 136205The flat plate LEDs have a different light output pattern (light primarily in one direction) than the bayonet style with LEDs pointing in all directions (light in all directions like the original 1159 style incandescent bulb). I got one of each to try, and found I preferred the bayonet style for most of my fixtures, but it's a subjective judgment. Note that the flat plate was absolute perfect for the range hood, and also worked well in some two bulb fixtures - one flat plate, one bayonet. I haven't tried it, but it might be a good way to convert fluorescent fixtures: they would be easy to wire in parallel, you could mix white and warm white boards, and I think it'd be easy to make the fixture brighter than with the florescent. Bumper's source would make it pretty cheap, too!I'm heading out to my SOB with a flat plate LED in hand to try in a fluorescent fixture ...Eric Greenwell
Re: LED Watts & Amps Reply #7 – January 14, 2013, 05:12:59 pm Yahoo Message Number: 136215QuoteThe flat plate LEDs have a different light output pattern (light primarily in one direction) than the bayonet style with LEDs pointing in all directions (light in all directions like the original 1159 style incandescent bulb). I got one of each to try, and found I preferred the bayonet style for most of my fixtures, but it's a subjective judgment. When converting incandescent fixtures, replicating the dispersion of the original bulb will produce a well-illuminated area. I know that LD uses LED fixtures with flat boards - presumably the fixtures are designed to work well that way, but I would doubt if they work as well for illuminating a wide area - such as on the ceiling.Steve
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