Retrofitting of ArabiSun SUN-12 & SUN-24 fixtures with LED
For some time, LEHLE SEEDS has been
evaluating LED lighting sources to replace the hot 27 watt 6500K
compact fluorescent "spring" lamps (CFL) traditionally
used in the fixtures of our SUN-12 and SUN-24 mobile light
carts. I report here that an equal mix of the new Phillips 60
watt equivalent "Soft White" A19 (socket) LED light bulbs
with the new Phillips 60 watt equivalent "Daylight" A19
(socket) LED light bulbs produces more and better quality PAR
(photosynthetic active radiation) without the excessive heat,
expense, and environmental hazard associated with the older CFL
spring lamps. For each existing 12 socket (A19 type) SUN-12 or
SUN-24 fixture, LEHLE SEEDS now recommends replacing all 12 CFL
bulbs with a "checkerboard" pattern of 6 Phillips 60W
equivalent LED "SOFT WHITE" (2700K) bulbs and 6
Phillips 60W equivalent LED "DAYLIGHT" (5000K) as shown
below. This combination, while appearing white to the
eye, supplies strong peaks in both the red (2700K) and blue (5000K)
regions of the spectrum which supports excellent Arabidopsis growth
with remarkably little heat generation.
Fred Lehle PhD
Cat. no. WT-02
Columbia Seed Contamination Update
On January 4, 2016 LEHLE SEEDS halted its WT-02 Columbia seed
temporarily to regenerate its Columbia wild type seed stock due the confirmed presence of a small percentage of Arabidopsis plants whose rosette leaf phenotype was dissimilar to
Columbia. An investigation of previous lots in our Columbia production pedigree has now been completed and the results are published in the March 2016 issue of the The Plant Cell in the following Letter to the Editor,
Mon-Ray Shao, Vikas Shedge, Hardik
Kundariya, Fredric R. Lehle, and Sally A. Mackenzie. Ws-2 Introgression in a Proportion of Arabidopsis thaliana Col-0 Stock Seed Produces Specific Phenotypes and Highlights the Importance of Routine Genetic Verification. Plant Cell 2016 28: 603-605.
To detect and and prevent any future introgressions between different Arabidopsis ecotypes from
Columbia planting seeds in the future, LEHLE SEEDS will grow,
without exception, Columbia separately in time and space from
the other Arabidopsis ecotypes we produce.
In addition, LEHLE SEEDS is currently implementing a new phenotype verification step in the production of our Columbia planting seeds. The purpose of this seed verification
step is to confirm that all planting seeds are derived only from
parents whose phenotype has been individually verified as conforming
to the Columbia ecotype. More details will be provided when they are available.
Customers with questions
can direct them to email@example.com,
or telephone 1-512-388-3945 or fax us at 1-512-388-3974.
Fred Lehle, Ph.D.
March 30, 2009
Update - New Organizer Insert, New Subirrigation Tray, New Cat.
recently substantially reconfigured the ArabiPot cat.
no. PTA-10. We removed the deep open subirrigation tray and
replaced it with two new components: 1) a new low -profile
subirrigation tray of the same footprint and 2) a intermediate
flat insert that organizes the 18 ArabiPots into a convenient
array. The new subirrigation tray prevents accidental
overwatering by setting an upper limit on the amount of each
irrigation. The new insert keeps the ArabiPots neatly
organized in an 3 x 6 array, something that was needed in the
original configuration. The insert has a perforated
bottom, so irrigation added to any portion of the insert is
immediately distributed equally in the lower tray. If the
growth space is available, the 3 x 6 array can be expanded with
multiple trays (6 total) into the common 9 x 12 array. We
designate this new configuration cat. no. PTA-126, which will
consist of 126 ArabiPots, 7 organizer flat inserts and 7
subirrigation trays. With the introduction of these new
components, cat. no. PTA-10 will be retired.
ArabiPots, Organizer Flats & Subirrigation Trays for Arabidopsis
includes 126 pots, 7 Organizer Inserts & 7 low-porfile subirrigation trays
To place an order
(Toll-free in USA)