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Old 05-31-2013, 10:30 PM   #1
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QUICK REVIEW = 921 Bulb vs 48 SMD LED Panel (China)

I replaced (12) 921 Bulbs with (12) 48 SMD LED Flat Panels today. They are available direct from China for $2-$4 each with shipping....

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Following are the stats recorded via light meter of a double fixture at 3' in the front and 2' to the side...

921 BULB

3' FRONT = 166 lux
2' SIDE = 62 lux

48 SMD LED

3' FRONT = 161 lux
2' SIDE = 40 lux

COLOR = LED is slightly cooler in color
SIDE DISPERSION = 50% less (a benefit in my low ceiling TT)
HEAT = LED Fixture was warmer than expected after 1 hr - yet still cooler than incandescent bulb fixture

Overall = I'm happy.....and I know my 12V converter is happier b'cuz the fan isn't running when all the lights are on....

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Old 05-31-2013, 11:42 PM   #2
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Good information. How did you measure your Lux’s.
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Old 06-01-2013, 06:42 AM   #3
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Quote:
Originally Posted by Jagiven View Post
Good information. How did you measure your Lux’s.
I have access to a commercial light meter....

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Here's more data. The 48 SMD LED Panel is 2-1/2"L x 1-5/8"W and mine came with 3M Mounting Tape...

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The wire leads are red / black (which bothered me b'cuz I could notice them through the lens / diffuser). I painted the leads / connector with White Dip-Coat Rubber Spray...

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Old 06-01-2013, 08:44 AM   #4
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I changed all my lights even the porch light to these same panels. They are brighter and run cooler. I am very pleased with the mod.
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Old 06-01-2013, 08:58 AM   #5
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Forgot to mention on the previous post that the double stick tape is worthless. I used a dab of silicone on each corner of the panel.
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Old 06-01-2013, 11:14 AM   #6
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Excellent info Threebutchers, thanks! I have been converting my lights over to these LEDs as well. Only difference is that I put in the 36 bulb LEDs instead of the 48s. I did a side by side comparison of the two and the LEDs give off a nicer light and they are bright but do not seem to be as intense as the incandescents. I also ordered a couple of the 12 bulb LEDs for the bunk lights which will be nice for the kids. The current 921s are too bright when one turns theirs on in the middle of the night to go to the washroom and wakes up the other two kids. Ryan
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Old 06-01-2013, 12:48 PM   #7
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Thanks for the additional comments...I forgot to include the drawing below....it shows a little clearer where the light measurements were taken from....

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Old 06-03-2013, 02:49 PM   #8
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We've converted our camper over to the LED panels as well. This was our first trip with them in almost the whole camper (I still have the two above the bed that have the incadescents, the LEDs are ordered but haven't come yet). Really happy with the quality of the light. Hotter than I expected, but still cooler than the old incadescents - which was our main goal as when we camp in August at the county fair it will be 90+ with high humidity in the direct sun and the 15k A/C can have a little trouble keeping up at times. However, like you I had the problem with the tape. I replaced the tape on a couple with other 2 sided tape and it didn't hold either. Probably this weekend (or whenever the last 2 come) I will go through and give each of the panels silicone to hold them in place.

I like the idea of the white plastic coat. I might have to do that as well.
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Old 06-03-2013, 05:56 PM   #9
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Jim - I think the next test is the durability. I'd be curious to know how everyone's hold-up after a few seasons.
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Old 06-03-2013, 06:57 PM   #10
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I converted all my interior lights to the same LED as mentioned in the original post. I will be heading out on a 2.5 month summer trip in a few days with many boondocking stops. This will be my real test as to the reliability and durability of these LEDs.
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