You have inbuilt parking lights on your Hymer..
same as our 660
turn light switch anti clockwise to the arrows, one puts left lights only, on other arrow right side only...
THEN go to campercare>>>
Welcome to the CamperCare website
look for the equivalent bulbs that are illuminated in the parking lights and replace with the LEDS.
we have changed ALL our [apart from Headlights] to LED
no problem parked up for 12 hours in the dark now..
Even the festoon bulbs in the wardrobe and marker lights have been changed
We are also 4.6 tonne gross so need to park with lights
Another thing is VOSA


are on about bringing in COMPULSORY reversing bleepers, for vehicles 3.5 tonne and over.
I've found an ingenious way with leds, some clever so 'n so combined bleeper in the bulb and they WORK, got two in the Hymer >>
From here >>
reverse bleeper bulb reversing T4 T25 camper 4x4 van X2 on eBay (end time 15-Dec-09 11:03:05 GMT)
Others want £7+ each, plus post. he does them for £4 for 2 plus £2.15 post.
I've bought a dozen and all are fitted in my Cars, my sons Cars and even put one in a mates bike as his STOPLIGHT
it's driving him mad looking for the bleep every time he brakes

My MOT examiner loves them as well and is fitting all his vehicles with them.....
Regarding the Flouro light over the worksurface, I removed all the gubbins and wired 2 of these in the original mounting plate, light is perfect and they use less than 10% of the power used by the 3 flouro tubes !!!
CamperCare Image Viewer
If anyones not sure I'll post a pic showing exactly how they fit in....