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Cool Tube Prima Klima 125x480mm
The Cool Tube Prima Klima 125x480mm is the compact air-cooled glass reflector engineered for grow spaces running 250W and 400W HPS or MH lamps. With heat extracted directly through the Ø125mm borosilicate tube by a connected extractor, the lamp can be positioned up to 50% closer to the canopy than with conventional open reflectors. Result: higher PAR delivery at plant level without thermal burn risk. Manufactured from BSG borosilicate glass with high-grade PVD Miro9 aluminium reflector panels (up to 95% reflectivity) and E40 ceramic lampholder. Nylon flanges isolate the cooling airflow from the lamp heat. Optimal for 80x80 and 100x100 cm grow tents where thermal management constrains otherwise-possible wattage. 360° mode supported.
Cool Tube Prima Klima 125x480mm — Air-Cooled Glass Reflector for 250W and 400W HID Systems
The Cool Tube Prima Klima 125x480mm represents the compact tier of Prima Klima's air-cooled glass reflector range, specifically dimensioned for grow operations running 250W to 400W HPS or MH lamps. The smaller Ø125mm flange diameter integrates cleanly with proportional ventilation systems — no need to over-size ducting for lamps that don't require 150mm-class airflow. Prima Klima has manufactured air-cooled reflectors since 1996, and the current v4 revision documents 3-4x lower lumen losses compared to the classic design through improved fin mounting and optimized reflector geometry. A reference product within the broader reflector range.
Operating Principle of Air-Cooled Glass Reflectors
Conventional open reflectors radiate the lamp's infrared emission directly toward the canopy — pushing sub-canopy temperatures above 35°C in typical 80x80 cm tents. The Cool Tube encapsulates the lamp within a sealed borosilicate glass tube through which connected extraction draws continuous airflow. The result: infrared radiation is mechanically expelled before reaching plants, while visible-spectrum and PAR-relevant wavelengths transmit through the glass with minimal attenuation. In practical terms, the lamp can operate at 25 cm above canopy for 250W, 40 cm for 400W — roughly half the clearances required with open reflectors.
- Dimensions Ø125mm x 480mm tube (505mm flange-to-flange): compact form factor suits 80x80 cm tents and integrates with standard 125mm ducting.
- BSG borosilicate glass tube: high transmission efficiency, thermal shock resistance, structural integrity under sustained thermal cycling.
- Miro9 PVD aluminium reflector panels: up to 95% reflectivity, environmentally compatible physical vapor deposition process.
- E40 ceramic lampholder: premium ceramic specification resists deformation and discoloration over extended service life.
- 600W maximum power rating: generously dimensioned for 250W and 400W applications, accommodates 600W with sufficient airflow.
Required Extraction Capacity
Proper Cool Tube 125mm operation requires extraction delivering minimum 200-300 m³/h through the tube — actual requirement varies with lamp wattage and combined back-pressure from filters. A 250W setup functions with modest extraction; 400W in enclosed tents pushes thermal load higher and warrants 300-400 m³/h effective. The Cool Tube integrates cleanly into serialized ducting with a carbon filter on the same extraction chain — both thermal and odor management flow through a single airstream, simplifying installation while ensuring reliable environmental control.
Size Variants and System Integration
For installations exceeding 400W in larger spaces, the Cool Tube 150x580mm variant provides larger flange diameter and tube volume appropriate for 600W and above. For complete installations, pair this Cool Tube with an appropriate 400W HPS/MH bulb selected for its target spectrum phase. The 360° rotation capability supports angled light distribution in non-rectangular spaces. Multiple Cool Tubes can be daisy-chained on a single centralized extractor — practical for multi-lamp installations in larger tents or grow rooms with coordinated ventilation.
Order your Cool Tube Prima Klima 125mm from Plant and Flower today and benefit from fast shipping across Belgium. The documented choice of Belgian growers running 250W-400W systems who require effective thermal management without oversizing their ducting infrastructure.
How does the 125mm Cool Tube compare to the 150mm variant in cooling efficiency?
Per unit of lamp wattage, the 150mm delivers slightly better thermal dissipation due to larger airflow cross-section (1.44x the tube area). The 125mm matches or exceeds the 150mm efficiency when used with its target 250-400W range because airflow velocity remains high and heat transfer coefficients stay favorable. For 600W or higher, the 150mm becomes increasingly advantageous. Choose based on lamp wattage matching — 125mm for 250-400W, 150mm for 600W-1000W.
Does the glass tube impact overall PAR delivery to plants?
BSG borosilicate glass transmits approximately 92-95% of visible and PAR-relevant wavelengths, with minor attenuation in the extreme UV range that HPS and MH lamps don't significantly produce anyway. The net PAR delivered to the canopy is actually higher than an open reflector at equivalent distance because the Cool Tube allows closer mounting, and inverse-square law more than compensates for the minor glass transmission loss. Field testing consistently shows net PAR gains with Cool Tubes versus open reflectors.
What maintenance does the Cool Tube require over its service life?
Primary maintenance is glass cleaning — accumulated dust on the tube can reduce PAR transmission by up to 50% if neglected. Clean with isopropyl alcohol and lint-free cloth between grow cycles; avoid abrasive cleaners that damage glass or PVD coatings. Inspect the ceramic E40 lampholder annually for signs of thermal aging. The nylon flanges and PVD reflector panels require no routine service under normal operating conditions. Expected total service life with basic maintenance exceeds 10 years.
Can the Cool Tube be used with LED lamps or is it HID-specific?
The Cool Tube is designed specifically for HID (HPS and MH) lamps which generate significant infrared heat requiring active extraction. LED systems produce substantially less thermal output and don't benefit from air-cooled enclosures — most LED panels are engineered with integrated passive cooling fins and open-air convection. Using LEDs in a Cool Tube offers no practical advantage and may actually reduce their efficacy by restricting passive heat dissipation from the LED driver electronics.
