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The number of lumens is the key term in determining if the LED light you are purchasing is adequate for your needs. That is why I have spent a lot of time researching suppliers. The lights I mentioned above are 240 lumens; this is equivalent to a 20 watt halogen bulb. Since the bulbs that came with our unit were just 10 watt halogens, we were pleased with the increased light output.
The other key thing to check is the temperature; we chose warm white which is compatible with most general light bulbs we use in everyday life. Some of the real cheap LED lights are Cool white which is more blue in color.
Finally, we actually wanted some heat generation from the LED bulbs so that moisture from humidity trapped in the fixtures would not build up. These bulbs put out just enough heat to accomplish this, but not nearly the amount that a 20 watt halogen bulb would.
For us, the costs were reasonable (about $8 per bulb; we were replacing halogen bulbs at $5 per, about every 8 months). We also purchased T2 and automotive base bulbs to complete the change out of our rig. We now have 100% 12 volt LED bulbs and 95% 120 volt CFL bulbs.
Everyone's mileage may vary, so choose wisely...
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