Some florescent light will work but I agree with the guy that said ask a
You should check for temp, humidity, light concentration and spectrum.
In-door plant growing is a science. In the case of 420 you have to check for
a lot more. (Like cops):(
On Sun, 31 Oct 2010 14:25:53 -0600 (MDT), email@example.com (Una) wrote:
BTDT- I didn't change anything. I bought 'warm' lights and
supplemented with a 60 watt incandescent. Some time before the
advent of gro-lights I read it was supposed to provide the ends of the
spectrum that fluorescents lack.
I've grown tomatoes, herbs, and cannabis with no problems from
legginess or lack of chlorophyll. My problems in my basement have
been more involving temperature and humidity.
For tubes: Get same-length (probably 4-foot) grow lamps, available at
home centers and some hardware stores, likely also the usual online
sellers including bulbs.com.
For ballast: (Assuming 4-foot F40) If the ballast is rated for F40
lamps and it is of the longer of the two sizes ("commercial grade"), then
keep it. If it is of the shorter "residential grade" (stool specimen) or
it is not rated for F40, replace it with a "commercial grade" one rated
for F40, preferably one rated for both 40 watt and 34 watt "lamps"
(bulbs) used in pairs.
Better still if the ballast is an electronic one. Pay attention to the
wiring diagram - electronic ballasts often have different wiring diagrams
than old-tech ballasts have, sometimes even different from other
electronic ballasts. Make sure you have your ballast configured for the
number of "lamps" (bulbs) that are connected to it, with compatibility for
both "true F40" and 34 watt "energy saver F40".
If the grow bulbs are 2-footers (F20): Most "preheat-start" ballasts
(need starters) only deliver about 16-17 watts to those. (They tend
to also be compatible with 15-watt.) Many "trigger start" ballasts easily
get "cranky" and/or (often both) appear to me to often underpower
20-watters, especially if they are also rated to be compatible with
However, replace such ballasts only if you can get a good electronic one
rated for 20-watt. If you have an electronic ballast option (including a
wiring option) good for 20 watt and not any wattages less than 18 watts,
use that. Otherwise, live with the existing ballast.
If you have a 2-footer ballast for 17 watt "lamps", then replace it with
something good for 20-watters. (Unless it has a wiring option
that makes it compatible/rated for 20-watt and not with/for 17-watt.)
Ballasts for 17-watters will significantly underpower the usual
20 and even 15 watt long-existing fluorescent bulbs, except for ballasts
with an option for wire connection change to power the
more-current-hungry 20 watt ones. An electronic ballast (even if
distinguished by wiring configuration option) that is compatible with
20-watt and not 17-watt should do well.
- Don Klipstein ( firstname.lastname@example.org)
On Oct 31, 4:25 pm, email@example.com (Una) wrote:
It's probably too far away and too little light for any thing but
starting stuff or house plants. Not full sun plants.
If you really want to grow crop style plants you need a ton of light.
Look at metal halide and high pressure sodium lights. You need about
1000 watts per 4'x'4' space. I've seen a 1000 watt metal halide bulb
held 6' p from a shadowed spot next to where full sun was shining.
The full sun was still brighter.
If you are just keeping tropical alive over the winter that works.
I've looked at some green houses that one of the local research
companies tests things with. They have a ton of those big round high
pressure sodium fixtures in it. Like the ones you sometimes see in
the ceiling of warehouse style stores. Except these are spaced about
4 times as dense and about 10' off the floor. Hate to see their
Good seed stock will grow under even the most adverse light
We grew some.... er... seeds back in '75. A simple 100W incandescent
bulb over a single damp paper towel sprout. This in the dead of
Winter in chilly Oregon in a barely heated abode in a lil' bedroom
closet. Damn plant grew like the dickens and was 10-12" tall in 3-4
wks. We hadda move, so plant never matured, but the harvested foliage
was waaay beyond satisfactory. Before you start putting out big $$$,
do some basic experimentation. The so called "experts" are usually
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