Forum Discussion
- Got my order from them. It was complete and received within the shipping time frame they said, about 2 weeks.
But seems like the light output is very low. Hooked it up to a battery in my garage at night and I've seen more light from a small flashlight. I'm disappointed. Thought the 5050 smd led's were 3 times as bright as the smaller 3528 size led. The lumen are suppose to be 15-18 per 5050 smd led. So thought thought 24-5050 was very simialr if not more than the 1141 bulbs in my TH now. Well the light output at first glance doesn't seem like it. Maybe when I get 1 mounted in the fixture it will put out more light, but I doubt it.
Is this a 24 5050 panel, or did they send me something else...?
Isn't it suppose to measure 5050...?
- I would think that .07 is within design standards and it's questionable if that caliper and the measuring points wouldn't have some error (I own the same caliper).
- "Is this a 24 5050 panel, or did they send me something else...?"
AllCool,
The spec sheet I found for white 5050 LEDs (http://www.wayjun.com/Datasheet/Led/5050%20SMD%20LED.pdf) shows between 14-16 lumens per LED, so 24 ought to yield roughly 360 lumens. The luminous efficacy of a typical incandescent bulb is 16 lumens per watt, so 360 lumens would only be equivalent to a 25W bulb... not particularly bright and considerably less than many of the flashlights I have stashed around the house.
I'm guessing you got what you paid for. westend wrote:
I would think that .07 is within design standards and it's questionable if that caliper and the measuring points wouldn't have some error (I own the same caliper).
Ok, makes sense.DAWg134 wrote:
"Is this a 24 5050 panel, or did they send me something else...?"
AllCool,
The spec sheet I found for white 5050 LEDs (http://www.wayjun.com/Datasheet/Led/5050%20SMD%20LED.pdf) shows between 14-16 lumens per LED, so 24 ought to yield roughly 360 lumens. The luminous efficacy of a typical incandescent bulb is 16 lumens per watt, so 360 lumens would only be equivalent to a 25W bulb... not particularly bright and considerably less than many of the flashlights I have stashed around the house.
I'm guessing you got what you paid for.
Thanks for the reply DAWg134...
My problem is the rated lumen don't seem to be there.
If I had to guess, I'd say maybe 3 or 4 of these panels 'might' be as much light as the 1141 th bulbs. Actually they seem so weak it might take even more to equal the TH 1141 bulbs.
My 1141 stock trailer bulbs are 18.4 watts and from what I've read, suppose to be approximately 260 lumen. My 1141 TH bulbs put out much much more light than these 24-5050 panels. The 24-5050 should put out over 360 lumen. Either the led ratings are way off, or all led smd 24-5050 panels are not created equally at all, huge difference.
Imo,the difference in light output is very easy to see looking at both, 1141 and 24-5050, both fired up in a totally dark garage. I know this isn't at all scientific, but don't have a light meter to get exact output. But by eye, Not even close... 1141 blows it away in output. I'd be surprised if these particular brand 24-5050 panels put out even 100 lumen.
I probably did get what I paid for. $18 dollars worth...
Its not much for 10 panels. But was hoping to get at least what was advertised as 24-5050 panels that truly put out anywhere close to 360 lumen... tgtbt- Hmmm... three panels not EVEN as bright as a single 18-watt bulb - that is indeed a serious shortfall in performance. I wonder if the panels you received are either wired for a different (i.e., higher) voltage or perhaps even a constant current power supply.
Since the panels you have are pretty useless as-is and returning them to China isn't really practical due to the cost, perhaps you ought to experiment with one of the panels and try a higher voltage - 18 or even 24 Vdc if you have the capability. You could even try interconnecting several 9V batteries; internal impedance of the batteries will likely cut down the effective voltage substantially, but there may be enough power to at least briefly test the panel.
I've been experimenting off and on for the last year or so to find suitable LED lighting for indoor photography. The technology is getting there, but hasn't quite made it into commercially packaged products. Nearly all LED lighting systems for photography consist of large panels populated with dozens or even hundreds of low-to-medium power LED elements.
A few months ago, I bought bits and pieces from several China-based eBay suppliers and was able to construct a 100W "single" element LED that generates 16,000 lumens. It requires a constant-current power supply, liquid cooling, a fan, reflector and focus lens... but boy does it put out the light! The light itself will actually warm your hand if you place it a foot or so in front of the beam, it's that strong. I still haven't figured out how to package the parts for use as a photo flood, so it's still sitting in a cardboard box. A metal cylinder in between the size of a 1-pound and 3-pound coffee can would probably do the trick, but the metal would have to be slightly more substantial to handle all of the mounting hardware and to dissipate heat effectively.
Anyway, the point is that I know it is very much possible to squeeze inordinate amounts of light out of these newer LEDs and there must be some way to (literally) make your 5050s shine... you just have to be willing to blow some of them up in the process. - We had a similar experience with this business while we were building our log home: Light In The Box
We ordered an item based on a picture. The product we received did not correctly match. We contacted them via their contact us page and explained. We wanted our money back and they argued that the picture was correct. I sent them back 2 pictures from their site - both different. They would not issue a refund but offered a concession from their store. I refused. They offered more concessions from their store. We eventually accepted and got more stuff and were ok with it.
You will notice there is no mailing address for this business and there was no US location for Light In The Box either. These are China distribution centers. You better be absolutely certain of what you order or be prepared. You won't win a battle. My 1141 stock trailer bulbs are 18.4 watts and from what I've read, suppose to be approximately 260 lumen. My 1141 TH bulbs put out much much more light than these 24-5050 panels. The 24-5050 should put out over 360 lumen. Either the led ratings are way off, or all led smd 24-5050 panels are not created equally at all, huge difference.
The LED ratings you used to transpose to actual use are just that, ratings. They are done under lab conditions where everything is controlled and different methods are used to get to that level.
I would doubt that an 1141 disperses 260 LM, more like 100-120LM.
Your last sentence in this quote is the crux, not all LED illuminators are equal. Even similar architecture and LED size from the same or different vendors may differ in output. For my use, I found that the SMD48-1210 are equivalent to the bulbs they replaced. My float voltages can range from 13.2->14.15 so supply voltage has never been an issue. I bought my panels from a variety of E Bay vendors, using small sample quantities until I received panels that I deemed acceptable. I do have one 12-5050 LED panel in 5000K temp that I find inadequate for it's application. It will be relegated to reading light or accessory location.
