There is various code used to label different luminance level or lux  level by each of luminares.

some use 835 CODE TO indicate 3500K color  temperature  which means white. sometimes some brand use 3500K  only to state the color.

Here are the example for the code indication 

 

Code
Colour Temperature
(in Kelvin)
Description
Colour Appearance
Possible applications
827 2700K Very warm white Similar to incandescent lamp, appear tinged with yellow and gives a warm "cosy" feel Recommended colour for average household use
830 3000K Warm white Colour of most halogen lamps, slightly whiter than incandescent Often used in white rooms for a clean and modern feel.
835 3500K White Standard colour for many fluorescent and compact fluorescent tubes  
840 4000K Cool white More clinical feel Ideal for use in areas where clear illumination is paramount, such as kitchens and offices. Also suitable for general lighting application in factories, parking lots, or warehouses.
865 6500K Daylight Extremely white, simulate natural daylight As it is very cold, generally not used for household applications unless specifically desired. Possible applications in horticulture, aquariums...
880 8000K Sky white Very cold white, with blue tones Used in specialist applications such as photography and architechural drawing.




 


figure 1 : Philips tube light show 4000K /840 CODE

Figure 2 : Tube light but use label with 4000K. 

why this happen ? although they are same type- from the figure 1 and 2 but use different labelling. can it be written like that? 

is there any different between them ,so different product will use different labeling.

because white colour has very wide range of variety,  it