Beam spreads for directional lights vary depending
on the lamp and fixture. For general lighting, choose a
wide flood with a beam spread of at least 50 degrees.
lamps are the most economical directional lamp and provide
good enough beam control for general lighting. Standard
A lamps with Alzak trim or compact fluorescents also
provide good general lighting.
Halogen PAR lamps offer more precise beam control
suitable for task or accent lighting. Low-voltage M-16 and
PAR36 lamps offer very precise beam control, making them
well-suited to accent lighting.
Because of their narrow
focus, spots produce higher illumination levels than floods
but over a smaller area. Beam spreads and lighting levels
for common directional lamps are shown in Table 5-24.
Aiming Lamps Mounted on Track Lighting
For accent lighting, eyeballs and similar adjustable
trims allow the homeowner to direct the light to the artwork
or architectural feature being lit (Figure 5-30).
These are typically used with a narrow spot to provide
bright focused light on a small area. Slotted wall wash trim
is used to splash diffused light on broad areas of wall or
bookcases. Nondirectional A lamps or compact fluorescents
work well in this application. General recommendations
for recessed lighting bulb wattage or bulb type and fixture spacing are given in Table 5-25.
Spacing Guidelines for Track Lighting Lamps
The general rule for ambient or task lighting may apply to track lighting spacing & aiming: that is to space recessed ceiling fixtures approximately the
same distance apart as the beam spread at the work
height, typically assumed to be 30 inches above the floor
(36 inches for kitchen counters). The beam spread is the
central cone of light, where the beam is at least 50% of
the brightness at the center of the beam.
publish beam spread data for their recessed lights
with different trim options. Beam spreads and lighting
levels for some common fixtures and lamps are shown in Table 5-26.
For accent lighting, space recessed or track fixtures so
their light hits the wall at about 30 degrees. For lighting a
large wall area, the distance between fixtures should be
equal to or less than their distance from the wall (see Figure 5-23).
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(Nov 4, 2014) Mahaveer said:
Solution for a classroom
Size 600 Sq.ft Ceiling height 9ft (Inssulated false ceiling)
Fixture: 5" dia with aluminum mirror type reflector
Bulb: Philips LED bulb of 7W or 9W
Illumination at ground level required is 250 lux
Could you please guide me for-
1.Number of fixtures needed
2.distance between fixtures
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