Landing Light 4522 Mounting

[SLOWR426]

Fellow ‘67 M20F owners, I got a 4522 bulb from Aircraft Spruce (P/N from the original IPD), not GE, and it doesn’t look right.  See photos attached.  There’s a parabolic copper reflector or something inside the bulb, and a single clocking nub so it doesn’t look like it’ll mount flat. My cowl housing does not have a cut-out for the clocking nub.  The old bulb had 3 standoffs.  Has anyone successfully mounted this bulb? If so, how do I clock it?  If not, what PN & Mfgr do you recommend for this model?  Thanks

[Hank]

I put a Whelen Parmetheus in the cowl of my C. Remove GE, undo wires. Set in Whelen, attach wires. Sign logbook. Done.

The hard part is droppong the lower cowl and putting it back on; my 3-blade Hartzell did not make this task any easier. I'm a Mechanical Engineer and am electrically challenged, but it was pretty easy.

[carusoam]

In the event you don’t get a reply...

Most people see what the LED doctor has on the shelf...

Often @OSUAV8TER has a list of things for sale...

He might even be able to explain what bulb you got... vs. the one you need...

For other creative ideas... search using the term tractor light bulb...

When clocking a standard bulb... turn it so the filament is vertical... horizontal cuts the life in half... from 10hours to five... 

PP thoughts only, not a mechanic...

Best regards,

-a-

[Raymond J1]

Normally, the housing of your landing light is like the one in the photo, with two screws pressure at 10am and 14: 30pm to adjust the position of the headlight. The bulb boss is down, which allows the filament to be vertical (better resistance to vibration). Note also that the screwed retaining flange exerts a certain pressure on the bulb. After reassembling the flange and all its screws (3), you can put the pressure screws back in position, which will slightly constrain the bulb against the flange. In the night, observation allows you to check a beam of the inclined headlight of 5% slope approx.