Light Bars & LED Lighting in Montana
Montana requires no cover. Off-road lamps mounted above 42 inches simply may not be illuminated while operating or parked on a highway, and no more than four front lamps over 300 candlepower may be lit at once.
Verified against primary sources · August 2026
What the law says
Contrary to widely repeated advice, no cover is required in this state — the rule is simply that the lamps are off on the highway. Mounting a light bar is legal everywhere; what states regulate is using it on public roads, and the usual constraint is a mounting-height ceiling plus a per-type lamp count.
Specific Limits
- Max lit
- 4 front lamps over 300 candlepower
- Max lamps
- 2 spot, 2 fog, 2 auxiliary driving lamps (16-42 in)
- Cover required
- No
- High mount rule
- off-road lamps mounted above 42 in may not be illuminated while operating or parked on a highway
Frequently Asked Questions
Are light bars & led lighting legal in Montana?
What are the exact light bars & led lighting limits in Montana?
Street-legal light bars & led lighting picks
Gear that helps you mod without a ticket in Montana.
Required on the road in Pennsylvania, Michigan, and Virginia — but check your state first: Illinois and Kentucky prohibit tinted lens covers.
Shop on AmazonHousings with SAE/DOT markings are what inspectors look for.
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