Q: What are COB LEDs?

A: COB (chip on board) LEDs consist of up to 100 LEDs packaged in a tight bundle to maximize light output from a small area.  When spaced appropriately, COBs provide the same coverage as an HPS bulb and generate much less heat and can be adjusted to suit any grow space.  

We use Cree CXB3590, Citizen CLU048 and Vero29 COBs exclusively as they most closely mimic the spectral output of the McCree Spectrum. Providing bright white light in all wavelengths between 400-800 nM, instead of just at the Chlorophyll A&B peaks as in red and blue LED fixtures, gives the energy required for all the plant’s physiological responses.


Q: What is the difference between the Citizen CLU048, Cree CXB3590 and Vero29 COB LEDs?

A:  We offer lights using Cree, Citizen and Bridgelux Vero29 LEDs.  With respect to efficacy and efficient output, these are very similar.  There are a few differences worth noting:

  • Cree does binning - Citizen and Bridgelux do not.  Binning is a method of categorizing LEDs by light output (lumens) at the time of manufacturing.  We only use top BIN Cree CXB3590 (CD/DB bin) LEDs.
  • Although the Citizen CLU048 COB is physically smaller than the CXB3590 COB it's electrical characteristics as well as spectral distribution is very similar to the CXB3590.
  • The Vero29 COB LEDs are the most efficient of the three types when driven above 50 watts/COB.  We drive our Vero29 lights at 100 Watts per COB with similar efficiency as the Cree and Citizen at 50 Watts per COB.  This makes the Vero29 a good value and offers significant cost savings over the Cree and Citizen especially over large coverage areas.  We use the Vero29 Generation 7 Type C COBs exclusively.


Q: What is the right light for full cycle, vegetative and flowering?

A:  All of our lights, unless denoted, are designed for full cycle usage.  The operating height and power output will vary according to the stage of growing you are currently in.  We recommend 3500K for full cycle usage (generally) and 4000K - 5000K for vegetative growing only. 

We also offer a color temperature for flowering only - the Vero products come in a 1750K color temperature (optional), which has a lot of red spectrum for flowering size and growth.


Q: What color temperature should I choose?

A:  Most customers choose the 3500K color temperature for full cycle usage (both vegetative as well as bloom/flowering).  The 3500K color spectrum has a good amount of both blue spectral output (400-450 nM for vegetative growth) as well as red spectral output (600-660 nM for flowering). 

For flowering/bloom only, most growers opt for 3000K as it has a more pronounced red spectral peak with slightly less blue spectral output, mimicking more closely the autumnal sun spectrum.

4000K and 5000K are good for vegging and also has many applications well suited for young plants.

Please contact us with any questions regarding the best color temp for your growing needs.


Q: How do I select the right wattage for my coverage area?

A:  The amount of wattage you select for your coverage area for flowering/full cycle usage is going to be based on it's ability to generate PPFD values of 900-1000 µmol/m²s.  Here is a list of typical coverage areas and recommended COB/Mid Power Diode wattages:

     2'x2'     200 Watts

     2'x4'     300 Watts

     4'x4'     600 Watts

     5'x5'     900 Watts

Our lights also come with dimmers.  If you dim your fixture, you will increase efficiency.  This will lead to more energy for the plants and less heat output.

For vegetative growth only, PPFD needs are about half that of flowering (roughly 500 µmol/m²s) which means you will need half as much wattage as you would for full cycle/flowering use.


Q: Can I mix color temps?

A:  Sure!  We can customize any light to include the color temps of your choice.  If you have specific needs let us know - our COB LEDs are available in 1750K, 3000K, 3500K, 4000K, 5000K and 6500K color temps.  You are welcome to mix and match color temperatures as well - there is no additional charge.


Q: Do I need a separate light for veg and a separate light for flowering/bloom?

A:  No, most of our lights (unless denoted) are for full cycle usage, meaning you need only one light for seed/clone/seedling to harvest.  We use LEDs which output a very bright white and offer color temperatures designed to mimic those of natural sunlight.


Q: Do you ship discreetly?

A:  Yes, all of our light ship in plain brown packaging and make no reference to "grow lights".  The return label simply says "Timber" and our return address.


Q: What is your order lead time?

A:  All orders are custom built to each customers individual specifications.  Allow up to 5 business days for fixture orders to be completed and 1-2 business days for kit orders.  Please contact us and we would be happy to let you know our current build lead times.


Q: What is your warranty?

A:  We offer a (3) three year warranty on all components.  Additionally, the Meanwell power supplies we use in all of our products come with a (7) seven year warranty backed by Meanwell.


Q: How much is shipping?

A:  We ship by USPS Priority Mail and UPS with 3-5 business days service to most of the US. Shipping quotes are available at checkout.

International shipping is available - please contact us at for shipping quotes.


Q: How high above the plants should I hang my Timber light?

A: Most growers operate the lights at 24-36" above the plants during vegetative growth and 12-24" above the canopy during flowering.  Additionally, our lights come equipped with dimmers allowing you to adjust the light output and coverage area to suit your individual grow environment.  Timber Grow Lights run very cool - cool to the touch - and can be used very close to the canopy.


Q: Where are your fixtures made?

A: Our grow lights are engineered and built in California by lighting professionals.  Timber Grow Lights are assembled using top of the line, cutting edge components from Cree, Citizen, Bridgelux, Meanwell, Cooliance and Ledil. 


Q: Why LED vs HPS?

A: LEDs compete with traditional HPS and Metal Halide HID lighting sources in a number of ways, including greater energy efficiency, longer lifetime, and smaller size. They, however, are more expensive.

LEDs operate at a much lower temperature so there are less cooling requirements (energy, noisy a/c and fans) – also, because they put out less radiant heat they can be positioned closer to the plant canopy.  The ability to configure LEDs also helps to increase their usability over HPS, which traditionally must be positioned higher – and directly above – the canopy.  LEDs can be placed in different configurations above the canopy to suit many different sized growing areas. 

Dimmers, included in all Timber products, enable the grower to power, or down, depending on the stage of growth, DLI requirements, and growing space.  There are no costly bulb nor reflector replacements required with Timber Grow Lights.  Plug them in and start to grow.


Q: Why are dimmers used in all Timber Grow Lights?

A:  Dimming helps to adjust the power of the light output, allowing for use at varying distances to the canopy, as well as adjusting the area of coverage. This is helpful in height constrained growing environments as well as situations where more PAR intensity is required.

Important to note – dimming the fixture also increases the efficiency. The “softer” the fixture is driven the less amount of heat output and therefore the majority of the energy is converted to photons of light energy to aid the plant in growth. 

All Timber Grow lights are able to be dimmed from 10-100% power, allowing maximum control of power and coverage area.  This allows the grower master control over the intensity and size of the light beam pattern.  Many growers use the dimming function during plant inspection and maintenance.


Q: Why are optics important....or not?  What are the benefits/drawbacks?

A: Reflectors and lenses are used to manipulate the light output. Reflectors 'reflect' stray photons of light back to the plant canopy. Think of them as a bumper for the light to bounce off of.  We offer LEDIL Angelina high efficiency reflectors with all of our products, designed to provide even light spread over a large area (up to 5'x5' in flower).  This allows for a nice even blanket of light across the entire canopy with no hot spots.

Lenses shape, or refract, the light beam shape. This is done to place the light energy precisely over the canopy. Lenses do inhibit the light more than reflectors given the light has to pass through the lens material and loses some of its power. 

All of our lights come with holders in order to add and remove Angelina reflectors in order to shape the lights coming out of your LED.  Some growers prefer to run without optics, or bare COB.  This has benefits in that a reflector will account for an 8% loss in power (PAR) output due to light loss.  By running closer to the plant canopy you can better control your light output and also mitigate any losses due to optics (reflectors and/or lenses).


Q: Why is cooling important with LED Grow Lights - how can I make my lights perform better?

A: We use a passively cooled design that manages safe operating temperatures without the aid of forced air induction by fans.  Maintaining airflow across the pins of the heat sinks aids in dissipating the maximum amount of heat as it speeds up the interchange of hot and cool air. We highly recommend using a clip on oscillating fan or other such fan in order to maintain a slow steady airflow across the heat sinks as this has been shown to lower the heat sink ambient temperature and will also aid in increasing our light's efficiency, and ultimately, PAR output.


Q: What is the importance of a well engineered heatsink?

A: Heat is the main enemy of LEDs.  Insufficient cooling can lead to diminished brightness and premature product failure.  Designed specifically around the Cree CXB3590 and Vero 29 V7 series, these heat sinks maintain a Tj (thermal junction) temperature well below that recommended by the LED manufacturers.  These special engineered pin cushion heat sinks are anodized single piece extruded aluminum, increasing the heat dissipation effectivity. Pin cushion designs help to provide more surface area for better cooling.


Q: What if I don't see the product that I want listed on your website?

A:  We do custom builds all the time.  Please contact us, and we would be happy to assist!


Q: We build our products with removable potentiometers (dimmers) - why?

A:  We make all our potentiometers removable (it's a waterproof fitting between the potentiometer and the power supply). We did that for two reasons:

1. The potentiometer is an analog device and as such is the part of any build most prone to failure. Making it removable helps in the event of a failure- you won't experience any down time and won't have to send the whole power supply (or framework) to us for repair. Just clip a new harness in place.

2. If you run the Meanwell HLG series with the potentiometer disconnected, the wattage at the wall (draw) will actually meet or exceed the stated ratings by Meanwell. This doesn't hurt the fixture and allows you to gain a little more wattage, and in turn, more PAR watts. You can simply connect it whenever you require dimming.

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