z Planar Irradiance method tests all relevant light specifications
z Easy to read reporting shows PAR, Photon Flux, Irradiance, Power
z Understand the energy consumption of your product
CSA Group Seattle (425) 605-8500 firstname.lastname@example.org
LED Horticultural Light Testing
Get a complete picture of the effectiveness and efficiency of your lamp
end-of-life, facilities personnel will have to
get back up on a ladder, remove the lamps,
remove the ballast housing, and then replace
the ballast. If a new ballast (or driver in Scenario 3) is installed at the same time as the
LED lamp, there should be no problem with
system life, and maintenance costs are generally reduced over the lifetime of the fixture.
Also common with Scenario 1 retrofits, the
installed fluorescent ballast is a switching ballast. Many TLEDs support dimming,
but the benefit of dimming (which further
reduces energy costs and can support task-ap-propriate light levels) cannot be achieved
unless the existing ballast is changed to an
LED driver. Today’s building energy codes
are compelling the adoption of energy-sav-ing controls, as well as including mandates
for occupancy/vacancy sensing, and daylight
harvesting (see lutron.com/energycodes for
more details). Sensor controls generally save
even more energy and enhance occupant
comfort when dimming is available. In some
cases, dimming is required by code.
TLEDs can significantly alter the amount
of light in a space, which may lead to uneven
light levels, different distribution patterns
on walls, and even glare. You can learn more
about these effects in a DOE Lighting Facts
sheet on upgrading troffers to LEDs (http://
bit.ly/2r5EX0C). Having the capability to dim
the TLED down to the appropriate light output may mitigate these factors while increasing energy savings.
Not all LED dimming options are created
equal. Customers are conditioned to expect
high-performance, flicker-free, continuous
dimming of fluorescent and incandescent
lighting to 10% or less. Poor-quality dimmable
drivers, or incompatibility of controls, can lead
to flicker and unreliable dimming and possibly premature driver, ballast, or control failure.
Proper product selection and matching of the
LED driver, LED lamps, and controls for your
application is crucial to optimal performance.
Most of today’s electronic ballasts comply
with NEMA 410, which stipulates the maxi-
mum amount of inrush current that an elec-
tronic device, such as a ballast or driver, can
draw. Complying with this industry stan-
dard ensures that turning the load on and
off will not cause any unnecessary stress to
the switching control, and will never cause
false tripping of circuit breakers.
Many LED drivers (including those used
internal to or external from TLEDs, as in Sce-
narios 2 and 3) do not meet NEMA 410 stan-
dards. So, despite their lower wattage, LED
drivers may cause undue stress on switch-
ing controls, leading to potential welding of
the switch contacts and failure of the control.
In extreme situations, heavily-loaded circuits
that turn on simultaneously (such as the situa-
tion after a power failure) may cause nuisance
tripping of a circuit breaker. As an installer or
customer, insist that TLED products that use
internal or external LED drivers comply with
NEMA 410 inrush current limits.
Choosing a TLED retrofit solution is a careful
balance — ease of installation versus cost versus performance. Even beyond performance,
safety is the overriding factor in any electrical-ly-based operation. For optimal performance
and the highest level of safety, the use of a
pre-certified solution consisting of a dedicated
LED driver with low-voltage TLEDs (Scenario
3) is recommended for most TLED retrofits.
LEDs Magazine has examined the application of TLEDs — also called LED tubes and T8s — as
their popularity has grown due to the large number of commercial and institutional buildings
that rely on such linear light fxtures.
How do plug-and-play T8s stack up against ballast-bypass LED lamps? http://bit.ly/1aDBPRO
LED tubes approach mainstream adoption despite complexities http://bit.ly/1QbzEEa
Hands-on testing of popular LED T8 lamps and linear fxtures reveals promises and pitfalls