L.E.D Replacement light bulbs

I bought these and I'm pleased with them, especially the price.
I'm not sure if the link will come up correct.

http://www.ebay.com/itm/20X-Warm-White-T10-921-194-RV-Trailer-42-SMD-12V-Backup-Reverse-LED-Lights-Bulbs-/261485199274

I installed a set of the flat board style led's with the adapter like 352 refers to. I am very pleased with the light output, I think thay are as brighter than the old conventional bulbs and use a fraction of the power.
The one bit of advise I can give, they come with 2 faced tape to stick them on, all of mine fell off after a hot day.
I cured this by applying a dab of high temp silicone to all 4 corners and sticking them back on, been fine ever since.

I have used a variety of style LED bulbs. There are many things to consider besides bulb base style. If your light fixture is designed for a bulb that shines in a 360 degree pattern you need a bulb of that type to get the use of the reflector built into the fixture, The flat panel lights will give a more one direction light. They generate enough heat so as to not stay stuck to the reflector and will fall down against the lens and lose all the light dispersal the lens provides. The light color is different. Bright white is a flat white but the brightest. Warm white is closer in color to incandescent light but will not be as bright. Blue white is more of an accent white than a practical living white. The number of LED's on a particular bulb doesn't always mean brighter. The type of LED and if it has a lens (the little clear plastic bump on top of the Led)will effect light output. If you see LED bulbs with flat LED's on the sides and Led's with lenses on the end of the bulb those are generally focused bulbs for back-up lights, tail or turn lights. They will work in a adjustable reading light over a bed or chair. Assuming you are looking at a online supplier like Ebay buy from a USA supplier. The bulbs will still be the same off shore stuff but you will generally get your bulbs in a reasonable time. Even though you probably need 15-20 bulbs to convert your TT start by buying a couple of pairs, one pair in warm white and 1 pair in bright white to see what you like. Look to buy from a supplier that also has bulk packs so if you decide that is the bulb you want you will be able to get the 15-20 you need at a reasonable price. I have one cargo trailer with 6 double fixtures down the center that I have 2 bright white LED bulbs in each fixture. My wife calls it stadium lighting because it is so bright. The fish house has directed lights so I can see to tie a hook. I am currently testing different LED bulbs for our TT to find a color and brightness my wife likes. Apparently stadium lighting is out. Your power savings will be worth the trouble to make the switch. I can run my cargo trailer lights about 15 hrs on a UBG 1290 battery,

wickedstang03 wrote:
Why should I not use the second ones?

When you push in and turn it loosens the led's and they start smoking. Not good. And the first one has an additional adapter. And there are more led's per bulb. And the price is cheaper.

I use M4LED http://www.m4products.com/led-rv-lights/ They will help identify the proper bulb, allow an exchange if the color is wrong and their waranty is the best. We changed out all of the bulbs in our 36" 5er and couldn't be happier

Why should I not use the second ones?

I use these. Don't use these And yes there is a huge difference. .25 amp LED compared to 1.3 amp conventional bulb.