Ultra Mist 4500 Humidifier 4.5L LCD Hygrostat | BloomLED

BLOOMLED / INDOOR GROWING

Ultra Mist 4500 Ultrasonic Humidifier - 4.5L LCD Hygrostat

Ref. HUMI-ULTRAM-4500

HumidificateurType

4.5 litresConditionnement

20x20x27cmDimensions (cm)

Hold your grow room at the ideal humidity, automatically — the built-in digital hygrostat keeps your setpoint between 40 and 60% RH, from cuttings through to late flowering, with no manual adjustment.

Selected and tested by BloomLED, an indoor growing specialist for more than 10 years: our technical advice comes from growers, not from a supplier datasheet.

4.5 L tank · Digital hygrostat · Dual 360° rotating nozzles · LCD screen + remote control

€88.40

Tax included

Shipping within 2 to 3 weeks

Your grow tent, your cycle, your project.Need advice before choosing? →

Free delivery

Take advantage of free home delivery in France from 100 € of purchase

Secure payment

Pay securely and pay by credit card in installments from €100 to €3,000

Secure parcels

The boxes we ship are all of high quality

Customer service

INDOOR GROWING HUMIDIFICATION

Ultra Mist 4500 Humidifier: hold your grow room humidity to the exact percentage you set

Relative humidity is the climate parameter indoor growers watch least and regret most. Too dry and the stomata close, growth stalls and leaf edges crisp up. Too wet and botrytis walks straight into your flowering canopy. The Ultra Mist 4500 does more than push out mist: its built-in digital hygrostat actively holds the setpoint you dial in.

Ultra Mist 4500 ultrasonic humidifier 4.5 L with LCD display and dual 360 degree rotating nozzles for indoor growing

A hygrostat, not just a mist maker

What separates a budget humidifier from the Ultra Mist 4500 is one word: regulation. A basic mist maker runs flat out until the tank is empty, swinging your grow tent from 45% to 75% RH in a few hours. The Ultra Mist 4500 reads ambient humidity continuously, compares it with your setpoint and switches nebulisation on or off accordingly. Set 55% RH for vegetative growth and it holds 55% RH — without you unzipping the tent three times a day.

That regulation changes the day-to-day reality of running a room. You no longer compensate by hand for the swing between lights-on and lights-off, and you stop chasing the hygrometer every time the extraction ramps up. The unit absorbs the variation and hands you a stable environment, which is exactly what roots and stomata need to work at full capacity.

Fine ultrasonic mist, delivered through 360 degrees

Ultrasonic technology generates a cold fog of very fine droplets that blends into the ambient air instead of condensing onto your leaves. The dual 360 degree rotating nozzles can be aimed independently: upwards to let the mist diffuse through the volume, sideways to cover a long tent, or in opposition to even out a full grow room. That aiming freedom is what prevents damp cold spots and wet foliage, two classic starting points for fungal contamination.

Built for everyday use: LCD, remote control, safety cut-off

The 4.5 litre tank fills from the top, with no dismantling and no spillage: one jug, one movement, and you are set for a full night. The touch LCD screen shows both the measured humidity and the target, while the supplied remote control lets you adjust mist output or the timer without squeezing behind your plants. The automatic dry cut-off shuts the transducer down as soon as the water level drops too low, so the ceramic never runs dry while you are away.

At BloomLED we have specialised in indoor growing for more than 10 years, and we judge every climate device by one question: does it still perform at the end of a full cycle? The Ultra Mist 4500 passes that test, from cuttings under a propagator dome through to late flowering.

Specification	Value
Device type	Ultrasonic humidifier (cool mist)
Tank capacity	4.5 litres
Built-in digital hygrostat	Yes, adjustable setpoint
Output nozzles	Dual 360 degree rotating nozzles
Display	Touch LCD screen
Remote control	Included
Automatic dry cut-off	Yes
Filling	Top fill (non-removable tank)
External probe	No
Power supply	100-240 V — 50/60 Hz
Dimensions	20 x 20 x 27 cm
Recommended humidity range	40 to 60% RH depending on stage
BloomLED reference	HUMI-ULTRAM-4500

4.5 LTank capacity

360°Dual rotating nozzles

40-60%RH under control

LCDTouch display

💧 Built-in digital hygrostat

You enter a humidity setpoint and the unit holds it. Nebulisation starts and stops on its own based on the humidity measured in the room. This is the function that turns a simple mist maker into a genuine climate control tool for your grow space.

🌀 Dual 360 degree rotating nozzles

Two outlets, each aimable independently through a full circle, spread the mist across the whole growing volume. Point the fog upwards or towards a wall rather than straight at the canopy, and you avoid droplets settling on leaves and localised condensation zones.

📟 Touch LCD screen and remote control

Measured humidity, target setpoint and timer are all visible at a glance on the LCD. The included remote lets you change settings from outside the tent, without disturbing the plants or opening the zip during the dark period.

🛡️ 4.5 L top-fill tank

Four and a half litres is enough to cover a full night of operation in most tent setups. Refilling happens from the top, with no need to lift out a reservoir or unplug the unit, so no more balancing a water container above your pots.

⚙️ Dry-run protection and timer

As soon as the water level becomes too low, the safety cut-off stops the ultrasonic transducer. Combined with the programmable timer, this protection means you can leave the unit running through a few days away from the room with complete peace of mind.

🔇 Quiet cool mist, universal power input

Ultrasonic nebulisation uses no powerful fan and no heating element, so operation stays discreet even when the grow space sits next to a living area. The 100-240 V / 50-60 Hz input works with any standard European mains installation.

What humidity level should I target when growing indoors?

The working window sits between 40 and 60% RH. Growers often push towards 65-70% for cuttings and early vegetative growth, while the root system is still limited, then step down gradually to 45-50% in flower to keep botrytis away from the buds. The Ultra Mist 4500 hygrostat is precisely what lets you move that setpoint stage by stage.

How long does the 4.5 litre tank last?

It depends on the volume you are humidifying, your extraction rate and the gap between ambient humidity and your setpoint. In a standard grow tent with a sensible setpoint, the unit only nebulises intermittently and one fill usually covers a full night or more. If the water runs out, the automatic cut-off protects the transducer.

Should I use demineralised water?

It is strongly recommended, particularly in hard water areas. An ultrasonic humidifier throws everything dissolved in the water into the air, minerals included: with hard water you get a white dust film on leaves and equipment, plus premature scaling of the ceramic disc. Reverse osmosis or demineralised water noticeably extends the working life of the unit.

Where should I place it inside a grow tent?

Set it up off the floor on a stable surface, clear of any standing water, rather than down among the pots. Aim the nozzles upwards or towards a wall instead of at the canopy, and leave some distance from the plants so the mist has time to blend into the air. Good air movement and a properly balanced extraction will handle the rest of the mixing.

How do I maintain an ultrasonic humidifier?

Empty and rinse the tank weekly rather than endlessly topping it up, because standing water always ends up growing a biofilm. Clean the ceramic membrane with diluted white vinegar and a soft brush as soon as a white film appears, then rinse with clean water. A descaled unit keeps its original mist output and lasts considerably longer.

A digital hygrostat, dual 360 degree nozzles and a remote control in a unit under 90 euros: the Ultra Mist 4500 brings genuine automatic regulation to a price bracket where most humidifiers still offer nothing more than a manual output dial.

✓ BloomLED selection✓ Indoor growing experts for 10+ years✓ Technical advice from real growers✓ Fast dispatch from France

Reference HUMI-ULTRAM-4500

Data sheet