Visually without the single lens is covered larger area.
{{gwi:1025820}}

:-( no one response :-)

Caelian

I'd respond, but I'm still using flourescents. In fact I was thrilled to find you could still get a T12 fixture!

The fixture is an old 28W 3000K (not a grow light) fluorescent just I removed all the components and use for these LEDs. I started with fluorescent with 6400K still I use it. I do not know which one is better, fluorescent or LED.

Now I removed all the lenses because visually it covers more area.

Thank you for the post.

Caelian

Well, I think you should ask yourself some questions.

First of all, though, to deal with part of your query (about
the lens). Anything between the light source and its
destination will be absorptive. That is, it will decrease the
intensity of the light supplied to your plants. However, you
need to consider, among other possibilities, whether it will
direct or concentrate the light more towards the plants than
without it. Also, will this lens offer any protection to the
guts of the device. If you are working with your plants, is
there a chance that you could bump the inside of the lamp
and damage it or destroy it.

Secondly, what is the intensity and spectrum of this light?
I see that you have only three of them mounted on your
old fixture. That's a good idea but are you getting the
same amount of light as you got with the fluorescent tubes.
As a very rough calculation, a two-tube fluorescent fixture
will run at about 5400 lumens output. This is not going to
be directed towards your plants very well, so they will get
less than that. How many lumens do your three LED
devices put out? That light will be more directed to the
plants so they might be more efficient in that respect but
how even is the distribution.

You could think about these things and possibly answer
your own question.

I wonder though - what is the brand and model or catalog
number of these lamps? Are they sold explicitly as grow
lights or did you just pick up some LED spots? Your photos
show a highly magenta tone, indicating that the spectrum
is largely red. That may be good but it is unclear from
what you have provided. Does the manufacturer provide
a spectrum chart? How much did they cost? Where?

Sneezer,
Thank you for the reply.

They have multiple lens the outer lens gives the light more concentrate to a particular spot. It could be consider as protector but without it there is no possibility to damage the device.

They are 4 LEDs in the fixture, my camera missed the last one.

The specification of the light:

Light Type :ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ Led plant grow light
Base Type :ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ Gu10/E27
Output Power :ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ 10W
Luminous Flux(lm) : 750-850lm
Led TipsÃÂ ÃÂ ÃÂ 100% new Epistar
Beam Angle :ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ 45 degree
Size: E27 49*89ÃÂ / GU10 49*86
Input Voltage(V) :ÃÂ AC85-265V
Net weight(g)ÃÂ :ÃÂ ÃÂ ÃÂ 70g
Housing Material :ÃÂ Aluminium+Class
Shell Material :ÃÂ ÃÂ ÃÂ Aluminum Alloy
LifespanÃÂ :ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ more than 50,000H
Warranty :ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ 2 years
Safety Standard :ÃÂ ÃÂ CE and ROHS
Storage condition: -40~85 degree
Led Configuration 3pcs Red and 2pcs Blue
Working Temperature: LED Wavelength Red:660nm;Blue:445nm
ÃÂ Color Red : Blue = 3:2

It cost about US $30 for 5 pieces. In the local online store it costs about US $80.00 for 3 pieces. My LEDs is from eBay.

Caelian

How about a led grow light full spectrum