Re: LED lighting Quality Checks
LED lighting has a non-flat color spectrum...white LED lighting is created by combining multiple nearly-monochromatic (narrow wavelength-bandwidth) chips. This might or might not be relevant. (Of course, fluorescent tube phosphor coatings also can have non-flat color spectrums.)
Sometimes the differing color-chips have different emission directionalities. This can result in odd color shifts off-axis from the light fixture.
Many LED lighting products take advantage of eye persistance, and pulse the chips with high current with a noncontinuous duty cycle. This generates more apparent brightness for a given chipset thermal dissipation. It however also creates some degree of strobe effect on fast moving objects. In my experience at home where I've recently installed a lot of LED lighting, this strobe effect is much more pronounced for some LED systems than for typical linear-tube fluorescent systems.
Some LED light strips that might be considered to replace fluorescent-tube fixtures have multiple LED chipsets at non-coincident locations. Because there are significant spaces between the chipsets, the light from such LED strips behaves as if it's coming from many point sources, instead of from a continuous line. When DUT reflection is a consideration, this difference in the specularity behavior of the light can be significant.