M4LED.com Reviews 

Back in 2015 and after some brand and product experimentation, I converted all lighting in the living areas of my Tiffin Class A to M4 LED’s, a total of about 50 bulbs of varying base types but mostly their Elite 1141 bulbs split between Cool White and Natural White color temps. In the 5 years since, perhaps 2 bulbs developed problems (flickering). I ordered 5 additional replacement bulbs but found their color temperature did not match the existing, older bulbs. After working with a guy named Steve at M4, they were able to find “old stock” that matched color temp, and shipped them to me at a discount and without shipping. A month or two later I ordered 2 more spares, perfect match. One of those bulbs proved defective, which is how I found M4 offers a Warranty on their bulbs and sent a replacement bulb free of charge!
For Quality of product and Quality of Customer Service, M4 is 5-Star.

I have used their products before with success and this time was no different. Called to find a fixture to replace florescent that went bad, they told me what would work and it's a perfect fit! Even a hand written note about wires I might find in RV and how to handle them. So glad I called and the shipping was super fast! Ordered on line and got the package a few days later, very happy.

M4 Products makes VERY HIGH QUALITY LED replacement bulbs for RV's and Automobiles. I have purchased LED bulbs from this company several times. I replaced all the bulbs in my Winnebago Adventurer Motor Home and in a 31 foot Jayco Travel trailer. The reason for replacing the bulbs is because you can burn all the bulbs at one and not use as much electricity and one of the standard incandescent bulbs. That means that the house battery will last much longer. M4 products LED's are unique in that they are of the highest quality. They are not like the cheap Chinese junk That amazon sells. M4 bulbs will last about 25 years steady burn without having to be replaced. That's longer than you will keep your Motor Home or Travel Trailer. That means you never have to replace a bulb. As a plus, LED's are warm to the touch and not hot like incandescent bulbs are. Steve at M4products will quickly respond to any email and M4 stands behind everything the sell. M4Products.com is a great company. You will never regret buying from M4 Products. This is an honest review of an outstanding company. I am not affiliated with M4Products.com in any way.