I would put 5 but one of the plastic plugs has already let moisture through. Unsealed is the best. However, it's been on my truck for about 2 months now. The magnets hold very well and my truck has driven over 70 mph many times. The light is bright and easily pushes people out of the way day or night. I recommend this light but I hope they solve the moisture problem. This problem will undoubtedly shorten the life of the lamp. Other than that, it's easy to set up and works great.
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