rkcstr has excellent test loads. Get two of them. That way you can have one set up for a red test, and one for a blu-ray... http://rkcstr.nfshost.com/
Jay
Just go to radio shack and get 3 or 4 N14001 diodes and a 1 ohm 1 watt resistor. Solder them all together and place your probes on either side of the resistor. 1mA = 1 mW Do a search and you'll find a diagram.
No, I'm not selling anything right now... I don't really have the time to build and mail out things until after my exams. I'll probably resume on Nov 24th.
This is the only resistor I found on RS's website which is 1 ohm, though a bit overkill at 10W. It's also 10% tolerance, which means your measurements may be off by 10%, which at 100mA, could be as much as +/-10mA, if you assume its value is 1 ohm. If you measure the actual resistance (though most multimeters are not very accurate at low ohms), you can more accurately calculate, but it really may not be necessary for your needs. I typically use 5% tolerance (higher precision high wattage resistors get pricey), but most I've seen are pretty consistent in their resistance anyway.
Here's the diodes, a 25 pack of various 1N00x-series. You can mix-match for the most part, the different numbers are for their maximum rectified voltage rating (no significant changes in their forward voltage drop).