Thomas & Karen Mitchell wrote:

...
So: I'll stay at 25 when in the car.

-- KG7U
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Tom Mitchell, Port Angeles, Washington, USA
http://www.olympus.net/personal/kg7u
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Every engineer, worth his pay, which I know, allow at least a 20% excess
on ratings.

50 X 20% = 10 watts

50 + 10 = 60 watts

I'd run the 65 and examine the glass mount now and then. You'll see if
damage begins and switch lower power.

Warm regards,
JS