Light Rail FAQ

Light Rail 3.5 Light Mover - Light Rail 5 Light Mover

How do I determine the end-delay setting?

There are many variables to consider for finding the optimum delay at the ends of the rail. Because these variables vary from garden to garden it's hard for us to make recommendations. Obviously a longer delay would dictate more light on the ends and less in the middle. A shorter delay would be visa versa. One of the most critical variables in determining the optimum length of delay is the plant to lamp tolerance. In effect if the plant to lamp tolerance is 4 to 8 inches a delay for any length of time would be detrimental to the plants because of the intense heat associated with grow lamps. i.e. moving the grow light is not only about light distribution. It's about controlling the heat the plants are subject to. Therefore the time delay adjustment on the ends of the rail is a good way to control the heat. The only way to control the heat in the middle of the rail is by adjusting the lamp height a.k.a. the plant to lamp tolerance. So from this we learn that plant to lamp tolerance and length of delay work in conjunction and the ultimately goal would be to maintain the best constant temperature from one end of the rail to the other.
If you look at a 10 rpm motor traveling on a 9 foot rail you can see that it will spend twice as much time in the middle 3 feet of the rail as it does on the ends, simply because during one down and back cycle the light passes over the middle twice. We call this "middle of the rail double time." More accurately, during one down and back cycle a 10 rpm motor on a 9 foot rail will spend about 90 seconds in the middle 3 feet of rail and 45 seconds moving away from each end of the rail.
We feel trial and error is perhaps the best way to achieve the optimum length of delay and plant to lamp tolerance. We suggest a good starting point might be a plant to lamp tolerance of 16 to 20 inches with a 30 second delay. This would dictate that a 10 rpm motor on a 9 foot track would spend about 90 seconds in the middle of the rail and about 75 seconds at and moving away from the ends of the rail during one down and back cycle. After observing plant growth you can then make the necessary adjustments.

10 rpm motor travels approx. 47.55 inches per minute
10 rpm on 9 foot rail "middle of the rail double time" = 90 seconds and 45 seconds on the ends
10 rpm on 6 foot rail "middle of the rail double time" = 60 seconds and 30 seconds on the ends

6 rpm motor travels approx. 28.53 inches per minute
6 rpm on a 6 foot rail "middle of the rail double time" = 100 seconds and 50 seconds on the ends
6 rpm on a 9 foot rail "middle of the rail double time" = 150 seconds and 75 seconds on the ends

Why move your light?

Moving one light on a 6 foot rail should increase your light's area of coverage by approximately 1.6. This translates into lower operating cost due to higher single light yields.
The lumens produced by a grow light decrease the greater the distance from the bulb. To avoid plant killing heat associated with stationary grow lights, the bulb must be kept at a greater distance from the plants. For example, your plants end up getting far less lumens than you are actually paying for. By moving your light, you may run a tighter plant to lamp tolerance (using more of what you are paying for) without generating plant killing heat. Again, this translates into lower operating cost through higher yields.
Moving your light from one end of your garden and back will give your garden light at a much greater variety of angles. This allows more light to reach the foliage at the bottom of the plant, which is normally shaded by the foliage at the top of the plant. As a greater portion of the plant takes part in the process of photosynthesis, lower operating costs result from greater yields.

Can my Light Rail 3.5 move more than one light?

The Light Rail 3.5 "Add-a-Lamp" package will accommodate 2 lamps running in line over a 12 foot span with only one motor. The Add-A-Lamp kit can be found at participating retail outlets.


How much weight can a LR 3.5 carry?

Light Rail 3.5 is rated to carry upto 35 pounds.

What's Intelli Drive?

The all new Light Rail 3.5 Intelli Drive with Solid State Advanced Control's fully integrated PCB Circuitry will give you the control you are looking for. With an adjustable 0-60 second time delay you can "fine tune" the length of delay at each end of your lamp's travel to meet your garden's ever changing needs.

What is a Robo Stik?

The all new adjustable grow lamp attaching device that positions, balances and stabilizes your lamp as you mount it to your Light Rail 3.5 Intelli Drive.

I need a copy of the Installation Instructions.

Light Rail 3.5 Intelli Drive System

"Robo Stik" Lamp Attaching Device

Add-A-Lamp System

Drive Wheel Replacement Kit

Can I cut the rail to 6ft, my rail is 78"?

Yes, you can cut the aluminum rail to what ever length you require. The switch stops will allow you to set the travel distance to what ever you want on the rail.

On my Light Rail 3 is there any way I can add a second light using just the six foot rail?

Yes, the drive rod (3/8 all-thread) and 6 foot additional rail are sold together. In order to get an add-a-lamp system without the extra rail you will have to purchase the drive rod from the local hardware store. In addition you will need to purchase the Add-A-Lamp Hardware Kit (small box containing the aux trolley, and mounting hardware). You will then be able to run two lights over 6ft without purchase additional rail you do not need.

Can I use a rheostat to control the speed of the mover?

No, a resistor is used for regulating a current by means of variable resistances. It will damage the circuits and cause the unit to fail.

How much weight can a Light Rail 5.0 carry?

The Light Rail 5.0 Commercial Drive is rated to carry 100 pounds.

How long is the crossbar on the Light Rail 5?

The Light Rail 5.0 crossbar can be adjusted to three seperate settings. 81", 87", or 93".

Light Rail 5.0 How do you attach multiple reflectors?

You can hang a reflectors from the eye hooks on each end of the crossbar. You can either mount the hood as show in the picture below or turn them 90 degrees. You can hang a light in the middle by passing the hanging chain over the center crossbar splint.


Light Rail 5, how do you balance multiple reflectors properly.

For the best operation we recommend you use the same type of light on either end of the crossbar. If you need to balance the crossbar you can adjust the 2 wing nuts where the splint attaches to the mover as shown below. WARNING: Be sure you can see at least 1 thread sticking out the bottom of the wing nut.

Crossbar Motor

Light Rail 5.0 Component Guide

Light Rail 5.0 Component Guide

Bitcoin Visa Mastercard American Express PayPal

Home | Products | Learning Center | Returns & Refunds | Shipping | Privacy | Testimonials | Contact | Login | View Cart |

Copyright 1992-2022 Greentrees Hydroponics
2180 Chablis Court, Suite 108, Escondido, California 92029