of LED's for
Bright enough to give a good reflective
light for the driver and are easily seen by bystanders.
Advantages, no heat to speak of, so
plastic lens work, low current drain and long life.
To power one white Luxeon LED from approx
12 volts, use a 33 ohm 5 watt
resistor in series
To power two white Luxeon LEDs in series from approx 12 volts, use a 22 ohm
5 watt resistor in series
To power three white Luxeon LED in series from approx 12 volts, use a 10 ohm
2 watt resistor in series
Or use LM317 three-terminal adjustable regulator as a constant current
source (current sense resistor = 4.7 ohm 1/2 watt)
Some details of the white LED lamp (headlight)
Luxeon Star/O part number LXHL-NW98
lens diameter 21.5 mm = 0.846"
square base 25mm x 25mm = 0.984" x 0.984"
overall height 15.7 mm = 0.618"
max current @ 25 degrees C (80 degrees F) = 0.35 Amps
max temp 75 C (plastic lens) = 170 degrees F
max current at max temp (75 degC) = 0.25 Amps
25 lumens output @ 1 watt input (similar to 2 watt halogen lamp if you could
half-power beam angle approx 10 degrees
about $US 15 each
Distributed by Future Electronics
Seattle area store
12100 North East 195th Street Suite 150
Bothell, Washington 98011
Tel.: (425) 485-6616
Fax: (425) 483-6109
or buy online from www.futureelectronics.com
by Bruce Wilson of the British
Colombia Society of Model Engineers (B.C.S.M.E.) Burnaby (Vancouver)