CSOBeech now offers PAR36 LED Bulbs for your
"tractor" or off-road vehicle for $65 each including FREE USPS Priority Mail
shipping to US addresses (International 1st Class Shipping available @$85 each). Your purchase
supports CSOBeech.com, still a FREE resource to the Beechcraft community
PAR36 DIMENSIONAL INFO - PLEASE READ BEFORE PURCHASING
A PAR36 bulb
dimension is 36 eighths of an inch (36 x 1/8") or nominally 4.5" in diameter.
Below is a chart for PAR bulb dimensions. Please note that some "tractors" use
the LARGER PAR46 bulb. Click HERE for PAR46 LED
Bulb availability info.
Please confirm the
diameter of your existing bulb to be sure it is indeed a PAR36 format. If you
know the existing Bulb PN that your tractor uses (for example GE 4509), you can
Google the PN to find a site that will give you the dimensions of your bulb.
PAR36 LED bulbs are a dimensional drop in fit for these amp sucking, relatively
low service life incandescent bulbs : 4509, Q4631, 4313, 4502, H7604, 4627,
4626, 4589, 4593, 4591, 4594, 4713, 4587, and 4505.
HERE for a list of popular bulb PNs where they list the PAR size. Once again, PAR36 Bulbs are about 4.5" in diameter.
The PAR36 LED bulb offered
here will NOT fit the nose gear leg mounting bracket of tractors. There
is simply not enough clearance at the back of the bracket for the depth of the
(~60* Beam Spread)
(~30* Beam Spread)
The PAR36 LED is offered in SPOT and Flood
beam patterns. The PAR36 bulb is approximately 4.5" in diameter. The Spot beam is approximately a 30* spread and the Flood beam is
approximately 60* spread and the bulb is compatible with 12V and 24V electrical
Read the wiki definition of "PAR" (parabolic
If you're still using amp sucking incandescent
bulbs in your tractor, teardrop spotlight or off-road vehicle, your electrical system will thank
you, especially if your vintage equipment still uses old-school generators,
famous for browning out during night operations
Below is a picture of a conventional
incandescent bulb just above the nose tire of a V35B "tractor" before installation of the CSOBeech
Below is a picture of the same "tractor" with
the CSOBeech PAR36 FLOOD LED making the below brightness on about 1.5 amps on a 12V
system. This shows the roughly 60* beam spread of the FLOOD bulb.
Below are pictures of the actual PAR36 FLOOD bulb
and the wire terminations (SPOT terminations are identical).
A good connection method is to crimp two 22-18 gauge (typically red sleeves)
ring terminals for a #6 or #8 stud (I forget what the bulb screw terminal is
originally) onto the bulb wires. Now place an appropriately sized vinyl sleeve,
heat shrink tubing or other insulative material over each ring terminal and
slide it out of the way.
Be sure you have
previously confirmed which airframe lead is Positive and which is Ground. You do
this with a voltmeter or an appropriate voltage test bulb. If you do not know
how to make the Positive and Negative voltage wire determination, STOP,
phone a friend who does know how to make this determination or call your A&P.
Then secure the bulb ring terminal to the airframe wiring. Connect the red
bulb wire to the Positive airframe wire and the black bulb wire to the airframe
ground wire. Secure each wire to it's airframe ring terminal using a short #6 or
#8 screw and nut.
Star washers on either side will insure torque is maintained over
time. Tighten the screw and nut combination and then slide the insulative sleeve
over the ring terminal and screw connection and use small wire ties to close
both ends of the sleeve over the wires.