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Mr Gazza · 19-02-2019, 09:32 PM

Hats off to you again Luddite for a full explanation. Thank you.

I thought about plasticine too, but did it this evening with a ruler across the bulb housing, measure from ruler to rim. then ruler across shell and measure from ruler to back of shell. subtract bulb to rim from rim to back of shell and a bit of compensation for the relative positions of the rim to shell to get the exact clearance.

So these figures are from the three pronged H4 flange (that locates the in the reflector) to the back of the shell. (this should be the measurement given for the heatsink in the listings).. ( The 4 chip is 30mm)

Bosch..40mm
Cibie.. 55mm
Autopal.. 50mm

The Autopal is back in now, with the 4 chip LED, ready to try once the valve service is done at the weekend, so watch this space.

19-02-2019, 09:32 PM	#202
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,813	Hats off to you again Luddite for a full explanation. Thank you. I thought about plasticine too, but did it this evening with a ruler across the bulb housing, measure from ruler to rim. then ruler across shell and measure from ruler to back of shell. subtract bulb to rim from rim to back of shell and a bit of compensation for the relative positions of the rim to shell to get the exact clearance. So these figures are from the three pronged H4 flange (that locates the in the reflector) to the back of the shell. (this should be the measurement given for the heatsink in the listings).. ( The 4 chip is 30mm) Bosch..40mm Cibie.. 55mm Autopal.. 50mm The Autopal is back in now, with the 4 chip LED, ready to try once the valve service is done at the weekend, so watch this space. __________________ Last edited by Mr Gazza; 19-02-2019 at 09:34 PM..