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Bulb types & forms
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- Some cheap series may have long starting time (up to couple of minutes to full brightness, e.g. Philips Eco) or some flickering (e.g. Era Eko)
- There is different forms (and areas of light shedding, areas near the base are normally do not emit light in LED lamps). It is important to select
form helping to direct light stream and to avoid getting bright lamp directly into ones eyes.
* E.g. P45 is smallest bulbs which might sit well inside lustre or other type enclosure protecting eyes from direct light
* R63 might be better suited to have a wide distribution of light from the working lamps (as the bottom shading the light is broad)
* On the other hand, some lamp forms might be better suited to shade light backward (toward plinth). It can be useful in some lustres.
- The last point is further strengthened in fillament lamps. Normal LED lamps has leds concentrated in a single place and normally light stream is
directed. Fillament lamps have LED more widely distributed and often emit light in all directions like old incandescent lamps. This again might be
useful for lustres.
Color
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- <3000K - warm yellow light for cosy atmosphere. But low contrast and will tire eyes if working
- 4000K - 5000K seems preffered for office settings, seems similar to natural lighting
- 6000K+ blue light, may be also good for office settigns. To be checked.
Lumens
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- LED lamps: lumens = wats * 80, old_wats = lumens/10 = wats * 8
Options
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Small fillament lamp (or at least with wide angle), preferable for Yerevan lustres: Philips ESS-LED-6.5-75W-E27-840-P45ND
* Cheaper variant (when direct viewing on lustre is unlikely) Era LED Standard B35-7W-827-E27 (6W / 480 lumens)
Work lamps: ??? Philips ESS-LED-7-70W-E27-4000K-230V-R63, Philips ESS-LED-7-70W-E27-6500K-230V-R63 ?
Powerful 800 lumes (10W) - 1440 lumens (18W) ??? E.g. Era LED Standard A65-19W-827-E27 / A65-21W-827-E27
Low-power in bedroom: e14 2-4W ??? E.g. Era LED Standard R39-4W-827-E14
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