An LED Grow Light Buying Checklist From a Procurement Manager: Mars Hydro TS3000, TS600 Wattage, and Zigbee Lighting

Every time one of our growers asks me to spec a new light, I pull up the same mental checklist. I am a procurement manager for a 12-person indoor farm, and over the past six years I have tracked roughly $180,000 in lighting-related spending. This article is the checklist I wish someone had handed me before I approved my first bulk fixture order.

It is written for commercial growers who are replacing HPS fixtures, expanding a mother room, or buying LED grow lights in bulk. If you just need a small light for a 2x2 tent, some of this is probably overkill. Read Step 2, maybe Step 5, and go on with your day.

Before you start: know what this checklist assumes

This checklist assumes you already know your crop, room size, and target DLI. If you do not, stop reading and measure those first. It also assumes you are buying more than one fixture. For a single small tent, the analysis cost can be higher than the light itself.

Here are the seven things I check before approving any LED grow light order.

Step 1: Measure your grow footprint, then match fixture coverage

The biggest mistake I see is buying three medium fixtures for a room that is actually one large open space. A Mars Hydro TS3000 LED grow light, for example, covers a larger footprint than a TS600, but only at the right hanging height. The fixture body size tells you very little. The coverage map does.

I put this first because every other calculation depends on it. Take actual measurements in feet or meters. Check ceiling height. Note where fans, ducts, and support beams are. If you are retrofitting an existing room, measure the current hanging points too. You do not want to order lights and then find out the only beam you can attach to is three feet away from the intended spot.

Step 2: Look up the true wattage and calculate monthly energy

The most common spec sheet search in our procurement tracker was 'Mars Hydro TS600 wattage'. Why? Because the name 'TS600' sounds like 600W, but the wall draw is lower. The TS600 draws roughly 100W from the wall. If you are budgeting energy, use the wall power, not the model name. The same applies to any fixture.

The formula I use: (true wattage × hours per day × 30 days ÷ 1000) × electricity rate. For example, 100W × 18h × 30 ÷ 1000 = 54 kWh per month. At $0.13 per kWh, that is about $7 per month per fixture. Multiply that by 50 fixtures and it becomes $350 per month. A 150W fixture instead of a 100W fixture would add roughly $175 more per month in this scenario. That is the difference nobody notices until the first utility bill.

According to the U.S. Energy Information Administration, the average U.S. commercial electricity rate was roughly 12-13 cents per kWh as of late 2024 (eia.gov). Use your actual rate, not the national average.

Step 3: Compare total cost of ownership (TCO), not unit price

The unit price on a product page is only the beginning. When I evaluated the Mars Hydro TS3000 LED grow light for a 5x5 flower room, I added three line items: the fixture itself, the Iconnect smart controller, and one replacement driver. The controller was not optional for us because we wanted Zigbee lighting.

Zigbee lighting control might sound like a residential smart-home feature, but in a commercial grow room it changes how we operate. I can create groups, set dimming schedules, and adjust intensity from a tablet instead of walking every light manually. That saves labor and reduces the chance of someone setting the wrong intensity. It does add upfront cost. If you have one room and a simple timer, skip it. If you have multiple rooms, it belongs in the TCO model.

Here is something vendors will not tell you: a low quote often does not include the controller, mounting hardware, or freight. I compared 8 vendors on a 60-fixture order once. The lowest bare fixture price looked great until I added the controller and shipping. The final total was 4% higher than the second-lowest complete quote. That is the kind of hidden math that shows up in an audit.

Step 4: Look at the photometric data, not the product photo

Forget the 'bulb led' aisle at the hardware store for a second. A regular LED bulb can light a small grow space, but it is not designed for uniform canopy coverage. Dedicated grow lights should have PPFD maps and, ideally, an IES file for lighting design software.

The most frustrating part of comparing LED specs is that every brand claims high PPFD, but test conditions differ. A PPFD map measured at 12 inches with a clean lens looks much better than one measured at 18 inches in a warm room. I always ask: at what height? What dimming level? What ambient temperature? If a spec sheet does not show test conditions, treat the number as marketing.

For the Mars Hydro TS3000 or any other fixture, the maps are published, but you still have to interpret them. Look for average PPFD across the coverage area, not just the bright center point. A fixture with a hot center and falling edges will make the crop grow unevenly and make harvesting unpredictable.

Step 5: Confirm you can buy a replacement driver

LED drivers fail. It is not a matter of if; it is a matter of when. The difference is downtime. I still kick myself for not confirming driver availability on our first batch of fixtures. When one driver died in Q2 2024, we had to pay for overnight shipping because no spare was in stock. That failure cost us more than the driver itself.

Before you place a bulk order, ask the vendor directly: can I buy one replacement driver separately? How long is the lead time? Many Mars Hydro models have a replaceable driver, which means a repair instead of a full fixture replacement. That is a procurement decision, not an electrical one.

If you choose a fixture with a built-in, non-replaceable driver, buy at least one spare fixture. It is expensive, but it is cheaper than losing a crop cycle while waiting for a replacement.

Step 6: Plan the installation before the shipment arrives

I have seen growers order lights and then realize the power draw is too much for their circuits. LED lights use less power than HPS, but they are not magic. Add up the amps. Check the wires, breakers, and outlet positions. Confirm that the hanging method can support the weight of the fixture plus the driver if it is mounted separately.

And yes, this is where the DIY question comes up. I keep seeing the phrase 'can i install recessed lighting myself' in lighting forums. For a standard recessed fixture in a residential ceiling, a careful DIYer can do it and have it inspected. For commercial grow lights with a remote driver, a Zigbee dimming network, and a hanging kit above water, I would hire a licensed electrician. This is not about saving money. It is about not taking risks with electricity and humidity.

Set the mounting height before installation. A light that is too low can cause light stress or burn the canopy. A light that is too high wastes energy and reduces PPFD at plant level. The fixture's coverage map usually tells you the optimum range, but you have to follow it.

Step 7: Run a one-fixture pilot before scaling

Buy one. Install it in the actual grow room. Measure PPFD at the canopy with a light meter. Log temperature and humidity. Create the Zigbee lighting schedule and test what happens during a power outage or a network drop. If it works, order the rest. If it does not, you have saved yourself from buying a full room of the wrong light.

My experience is based on roughly 200 mid-size orders for indoor and greenhouse top-light setups. If you are running a vertical farm or a high-light greenhouse, your pilot period is even more important, because light interacts with cooling and ventilation in ways that spec sheets cannot predict.

Common mistakes I have made (so hopefully you do not)

• Trusting the model name as wattage. The TS600 name says '600', but it draws around 100W. Use the driver label for load calculations, not the marketing name.
• Ignoring the controller cost. Zigbee lighting is a separate budget line in a commercial bid. If you do not plan for it, it will surprise you.
• Not asking about spare drivers. A low-cost fixture can result in a high-cost failure if there is no replacement path.
• Confusing DIY residential lighting with commercial grow lighting. 'Can I install recessed lighting myself?' is a different question from 'Can I install a networked grow light above a water table?' The first one might be DIY. The second one should not be.

When to ignore this checklist

If you are a home grower with one small tent and a simple crop, you do not need a full TCO spreadsheet. A Mars Hydro TS600 with a timer may be all you need. If your crop has very low light requirements, do not let a larger fixture talk you into extra capacity. The best light is the one that matches your canopy, your budget, and your workflow.

For commercial horticultural lighting purchases, the DesignLights Consortium QPL is a useful place to check standardized performance data (as of January 2025). And as always, verify current specs and pricing on Mars-Hydro's official store before ordering. Prices and product details change.