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Secret Jardin Cosmorrow 40 Watt Grow
The Secret Jardin Cosmorrow 40 Watt Grow is a standalone 87 cm LED bar running a 100% 6500 K spectrum, intended for the vegetative stage. It works on 24 V and is supplied without a power supply: it connects to a Cosmorrow driver or to any other 24 V supply. At an efficacy of 2.70 µmol per joule, photon output comes to roughly 108 µmol/s. The bar is 1.6 cm thick and weighs 0.30 kg, so it can sit close to the canopy; the manufacturer specifies 15 cm. Mind the length when replacing: Secret Jardin makes several 40 W bars that are not interchangeable. Rated service life is 50,000 hours.
Secret Jardin Cosmorrow 40 Watt Grow – standalone 87 cm LED bar on 24 V
The Secret Jardin Cosmorrow 40 Watt Grow is an 87 cm LED bar running a 100% 6500 K spectrum, intended for the vegetative stage. It works on 24 V and ships without a power supply. At an efficacy of 2.70 µmol per joule it delivers roughly 108 µmol/s of photon output.
Technical specifications
| Power | 40 W |
|---|---|
| Supply voltage | 24 V DC |
| Efficacy (PPE) | 2.70 µmol per joule |
| Photon output (PPF) | approximately 108 µmol/s |
| Spectrum | 100% 6500 K |
| Length | 87 cm |
| Width | 3.2 cm |
| Height | 1.6 cm |
| Weight | 0.30 kg |
| Service life | 50,000 hours |
Lamp and power supply are two separate orders
This is where most orders go wrong. Cosmorrow bars are sold separately from the power supply. Where a Cosmorrow or TNOLED set is already installed and a bar needs replacing, this lamp on its own is the order. For a new build, a 40 W Cosmorrow power supply is needed alongside it, or any other supply delivering 24 V. That separation is the point of the range: one supply can run several bars, and a failed bar does not take the whole installation with it.
Check the length before replacing
Secret Jardin makes several 40 W bars in different lengths, and they are not interchangeable. The manufacturer flags this explicitly in its datasheet. Measure the bar coming out before ordering, and check the spectrum too: this version is the grow model at 100% 6500 K. A warmer-spectrum variant exists for flowering, along with infrared and ultraviolet versions used as supplements. The range also runs at two efficiency levels, and this bar belongs to the higher one at 2.70 µmol per joule.
Where it fits
- Low heat output — the manufacturer specifies a distance of 15 cm to the canopy
- 1.6 cm thick, so usable in a propagator or cabinet where headroom is scarce
- As a supplement beside an MH or HPS lamp, or vertically along a plant row
- Several bars on one supply, provided the total stays within that supply's rating
The quoted 50,000 hours is a guide figure under normal use: at twelve hours a day that covers several years. An LED bar rarely fails outright but gradually puts out less light, so replacement is judged on results rather than on a counter. Keep the bar clean, since dust on the housing costs output without giving any sign of it.
For a ready-made set rather than separate parts, the TNOLED 2x40 W Grow is the complete version. For flowering, the TLED Bloom bar supplies the warm-spectrum counterpart. The full range sits in the Secret Jardin TLED category. Shipped from Belgium throughout the Benelux via plantandflower.be.
Does the Secret Jardin Cosmorrow 40 Watt Grow include a power supply?
No, the bar is sold on its own. A supply delivering 24 V is still required: either a Cosmorrow unit from the same range, or any other 24 V supply of sufficient rating. When replacing a bar in an existing set, the supply already fitted does the job and only the lamp needs ordering.
Will this bar fit any Cosmorrow set?
Not automatically. Several 40 W bars exist at different lengths, and Secret Jardin warns they are not interchangeable. Measure the one coming out and compare it against the 87 cm of this version. Check the spectrum as well while you are at it: this is the grow model rather than a bloom or booster bar.
How many bars can run from one power supply?
As many as the supply's rating allows. Each bar draws 40 W, so add up what you intend to connect and set that against the stated output. Leave headroom rather than sitting exactly on the limit; a supply held permanently at maximum runs hot and has a shorter life for it.
Grow or bloom — which spectrum should I pick?
This version is 100% 6500 K, a cool white belonging to the vegetative stage. Flowering wants a warmer spectrum weighted towards red. Running both stages from one fixture points to a full-spectrum model instead; building light stage by stage means combining bars of different spectra on the same supply.