Originally Posted by
UK_Cyclist
How do you mean exactly? The back-light from the computer-screen interfered? Or a separate light you had fixed to your bike?
At night, EM interference from my front light would disrupt the wireless signal to the computer so speed and cadence would occassionally display as zero. Seemingly a common problem with analog wireless. ANT+ is digital so no such problem with Garmin. Nice big display on the Sigma though, but you can't keep its backlight on permanently.
Of course, it'd be nice to purchase a Garmin, but it's way above my price-range!
Don't buy one of the above and save up!