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Lumatek MH 250 Watt
The Lumatek MH 250 Watt is a pulse-start metal halide grow lamp rated at 323 micromoles per second of PAR output and 21,000 lumens, giving a luminous efficacy of 84 lm/W. Its 4,200 K blue-weighted spectrum targets vegetative development, producing compact structure and dense foliage rather than stem elongation. The E40 base and BT63 envelope fit standard horticultural sockets, and the lamp runs on any 250 W ballast, magnetic or digital. Rated life is 10,000 hours with CRI 65 colour rendering, and pulse-start ignition keeps warm-up and restrike times short. Coverage is roughly 60x60 to 80x80 cm of canopy. Order the Lumatek MH 250 Watt online for fast shipping across Europe.
Lumatek MH 250 Watt pulse-start metal halide grow lamp
The Lumatek MH 250 Watt is a 250-watt horticultural metal halide lamp with an E40 base, delivering 21,000 lumens and 323 µmol/s of PAR at a colour temperature of 4,200 K. Its blue-weighted spectrum is built for the vegetative stage. It sits within the 150 to 250 watt grow lamp range and pairs with any ballast rated at the same wattage.
Photon output versus lumens
Lumens describe brightness as the human eye perceives it; plants respond to photon count instead. PPF, measured in micromoles per second across the 400 to 700 nm waveband, is therefore the figure worth comparing between lamps. At 323 µmol/s from 250 watts of input, this lamp sits in the expected performance band for a quality single-ended metal halide source. Two lamps quoting identical lumen figures can still perform very differently in a growing space, because the spectral distribution behind that number is not the same.
- 323 µmol/s PPF: photosynthetically active photons emitted per second, the primary metric for plant response.
- 84 lm/W efficacy: light produced per watt drawn, a useful proxy when comparing lamps of identical wattage.
- 4,200 K spectrum: blue-heavy output that keeps internodal spacing short and leaf mass high.
- CRI 65: colour rendering accurate enough to spot chlorosis or nutrient issues by eye.
Pulse-start ignition and ballast pairing
Pulse-start technology fires the arc with a short high-voltage pulse instead of a dedicated starting electrode. The practical result is faster warm-up at the start of each photoperiod, quicker restrike after a power interruption, and better PAR maintenance as operating hours accumulate. Any 250 W ballast will run the lamp, but a digital unit such as the Lumatek 250 W digital ballast makes the most of the ignition characteristics. Ballast and lamp wattage must always match exactly.
Where a 250 W HID still makes sense
LED fixtures dominate the efficacy conversation, yet a 250 W metal halide remains a low-cost, well-understood way to light roughly 60x60 to 80x80 cm of canopy. Replacement bulbs are inexpensive, the spectrum is predictable, and the radiant heat is welcome in cooler rooms. Fit a proper reflector shade to redirect output back onto the canopy, then switch to a Lumatek HPS 250 W on the same ballast when the crop moves into its red-dominant stage. Keep the ballast, change the bulb: that is the whole upgrade path, and it is why HID setups remain cheap to maintain over several seasons.
Technical specifications
| Lamp type | Metal halide (MH), pulse-start |
|---|---|
| Power | 250 W |
| PAR output (PPF) | 323 µmol/s |
| Luminous flux | 21,000 lm |
| Luminous efficacy | 84 lm/W |
| Colour temperature | 4,200 K |
| Colour rendering index | CRI 65 |
| Lamp current | 3.0 A |
| Rated life | 10,000 hours |
| Base / bulb shape | E40 / BT63 |
For growers who want measured, repeatable vegetative growth without rebuilding their lighting setup, the Lumatek MH 250 Watt is a straightforward drop-in choice. Order online today and benefit from fast shipping across Belgium and the rest of Europe.
Metal halide or HPS - which should I run when?
Run metal halide during vegetative growth and HPS during flowering. The Lumatek MH 250 Watt emits at 4,200 K, a blue-weighted spectrum that drives leaf development and keeps internodes short. High pressure sodium shifts the energy into orange and red, which suits the reproductive stage far better. Most growers swap the bulb mid-cycle and keep the same ballast and reflector.
What size area does 250 watts cover?
Expect usable coverage of roughly 60x60 to 80x80 cm. That matches a compact tent or a partitioned corner of a grow room. Push to 100x100 cm and edge intensity drops noticeably, at which point 400 watts becomes the sensible step up. Hanging height also matters: raising the lamp spreads light wider but reduces intensity at canopy level.
How many hours will the lamp last?
Rated life is 10,000 hours, around eighteen months at an eighteen-hour photoperiod. In practice most users replace metal halide bulbs sooner, because PAR output declines gradually long before the lamp actually fails. Pulse-start ignition slows that decline but does not eliminate it. Record the installation date so replacement is a decision rather than a surprise.
Do you ship across Europe?
Yes. Orders leave our Belgian warehouse for destinations throughout Europe, with lamps packed in protective cartons because the quartz arc tube and outer glass are fragile. Inspect the envelope on arrival before installing it, and always handle the lamp by the E40 base. Fingerprints on hot glass can create localised overheating.