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Reccomended sequence for selection of LED luminaires

1. Dimensions and design:
 For mounting to the ceiling or to the wall – surface-mounted 300*600;
 For mounting on suspensions (for example: in supermarkets - for illumination of large room by luminaires in long rows) – suspended 300*600;
 For mounting into the ceilings of Armstrong type. In this case there are the following variants:
the first: 300*600 (cheaper variant, which needs additional parts of Armstrong plate and T-bar);
the second: 600*600 (mounted into the whole cell of Armstrong ceiling, easy installation, but the price is higher on 20%   comparing with the previous luminaire with the equal luminous flux).

2. Color temperature:
 Work rooms, warehouses, halls - 5000К;
 Educational institutions, living area (not for sleep zones) - 3500K-4000К;
 Kindergartens, living area (recreational and sleep zones) - 3000К.
3. Power factor:

 For procurement activities by state-run institutions (public funding) – models with power factor more than 0.9;
 Absence of the previous demands for high power factor allows the models with not rated power factor (the efficiency factor is slightly higher).

4. Luminous flux:
 For one-for-one luminous flux replacement of standard office lamps with four fluorescent lamps 18W each, luminaires with 2500lm flux are used;
 For standard decisions on new projects as well as for replacement of fluorescent lamps with concurrent increase in luminous flux the models with 3300lm flux are used;
 For large rooms with high ceilings luminaires with increased luminous flux (4900lm, 5500lm) can be used. Thus less quantity of luminaires is purchased and less funds are spent to reach the needed total luminous flux;
 For background lighting of large areas with low attendance, as well as for small rooms, luminaires with low luminous flux (1500lm) are used.

5. Ripple factor of light in different modifications of LED luminaires by VTN:
 Less than 1%;
 Less than 5%;
 Less than 10%.
For the majority of variants even 20% is good. For mechanical sectors and computer rooms no more than 10% is required and only for some special rooms (video filming, halls with special  photoresponsive equipment) no more than 1% is required. For comparison: the ripple factor of  popular fluorescent lamps with starter units – more than  40% (in some models – more than 60%!).
6. Type of light diffuser:

 For computer rooms and for rooms with high ceilings luminaires with narrowed luminous flux are required; 
 For halls luminaires with extended luminous flux are required;
 For art galleries, studios and recreation areas opal glass is required.