I used to own a Volvo V70 and had it converted to run on LPG, 72 ltr doughnut tank fitted in to the spare wheel well, under the car was the original 70 ltr petrol tank, with all the pipes entering in to the spare wheel well, and guess what, surrounded on all sides with electric cables,relays,switches, brake lights going on and off, indicators flashing away, millions of tiny sparks waiting to ignite the tiniest whiff of LPG, or the aroma of petrol fumes, it never happened, most probably never will, but yes there was a risk there, and of course a risk assessment had been undertaken, and if that was deemed to be safe, I feel pretty sure a self contained light fitted in your front locker, switched remotely, as in the case of my Senator will pose very little risk, and to air on the side of caution you could always open the front of the gas locker for a few minutes to allow for any gas to disperse before you operate the light, but personally I do not think it necessary.
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