Look for a color temperature label listed in "Kelvin". A solid warm white that does not qualify as plain yellow, would be 3500K. 2700K would be something like a "true yellow". An incandescent bulb is supposed to be close to 3500K
To verify the power of the strip, forget about wattage ratings and instead ask about "Milliamps". Power voltages will (usually) be the same but the higher the milliamps are the brighter the strip will be. Most yellow lighting is used when dimmed, for atmosphere and ambiance.
You will probably have to query to get your two preferred values from the seller or manufacturer but it's worth taking your time about.
This may be worthy of a follow-up inquiry:http://www.kichler.com/products/product/led-tape-2700k-16ft-bk-116l27bk.aspx
