tenbear wrote:
The 48 SMD panels use the 1206 LED, an older design that is not as bright as the newer SMD LEDs. The 36 LED panels use the 1210 LED while the 24 LED panels use the 5050 LEDs. I think you will find that the 24 5050 SMD LED panels are the brightest, but also the most expensive. I would guess that they are more reliable too.
I suspect which LEDs were used is more a matter of the manufacture date and what was state-of-the-art at that time. I have purchased 24, 36, and 48 LED panels, and on the ones I have, more LEDs gives more light.
Anyway guys, there is no need to over-think these conversions when you can buy the panels for less than $3 each with free shipping. I suggest that you just order a few and give them a try. You really can't go wrong with any of these cheap 24, 36, or 48 LED panels that look basically like this:

They all put out a beautiful light. Note that the LEDs are yellow colored when not on, but when on the light is near pure white (I'm thinking that the yellow cancels out the native bluish LED color).
If you are looking for a dim light for background or atmosphere, just order a panel with less LEDs on it (such as a 9 or 12 LED panel), or order a LED "bulb" replacement (as low as 1 LED). I just ordered a couple of different types of wedge base LED bulb-replacements for my swivel-base reading lamps (one 9 LED bulb and one 5 LED bulb, at a buck a bulb with free shipping), and I am anxious to see how they work out. If they don't work out, so what at that price?
Have fun out there....