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September 15, 2023, ebay user nobelsalesservice wrote:

"Fast international delivery, thanks"

After extensive testing of various LEDs, I have identified the ideal options for those embarking on DIY microscope conversions. Among these, the standout choice is this high-power 1200 lumens cool white CoB LED, which includes a dimmer. This CoB LED not only boasts exceptional brightness but also boasts an impressive Color Rendering Index (CRI) of 90. It's worth noting that many competitors rely on LEDs with significantly lower CRIs, often around 72.

This particular LED is particularly well-suited for Labophot, Optiphot, BH2, and other large-size laboratory microscopes. For Labophot 2 users, a slide potentiometer perfectly complements the dimmer function. Please keep in mind that effective heat dissipation is essential for this LED, necessitating the use of a substantial heat sink. Affixing the LED to the heat sink is efficiently accomplished using thermo glue. Furthermore, to power this LED, I recommend employing a 17-18V DC converter. Additionally, a 5W resistor is included for those employing 2-5X objectives, allowing you to modulate the brightness as needed. It's important to emphasize that this LED emits intense brightness and generates considerable heat.

It's crucial to be aware that this LED is not suitable for smaller Alphaphot and CH2 type microscopes, as its power output is overpowering for these compact setups. If you require LEDs better suited for confined spaces, I invite you to explore my alternative listings or reach out to me directly for recommendations.  See eBay item number: 295455112159

Here are the specs:

* Luminous Flux/Radiant Flux: 1200 lm
* Illumination Color: Cool White
* Wavelength/Color Temperature: 5000 K
* Color Rendering Index: 90 CRI
* Forward voltage options: 18V
* Maximum drive current: 1200 mA (18 V)
* Maximum Operating Temperature: + 140 C
* 85 °C binning and characterization
* Mounting Style: SMD/SMT     
* Package / Case: COB - Chip-on-Board     
* LED Size: 15.85 mm x 15.85 mm x 1.7 mm
* Lens Color: Yellow     
* Lens Dimensions: 8.9 mm     
* Lens Shape: Round Flat     
* Lens Transparency: Clear
* 115° viewing angle, uniform chromaticity profile
* Top‑side solder connections
* Thermocouple attach point
* NEMA SSL‑3 2011 standard flux bins
* RoHS and REACh compliant
* UL® recognized component (E349212)

As with all "high-power" LEDs it can get very hot, so please ensure your heat sink can cool it down.  You're buying this LED at your own risk, and with the understanding it is a fire hazard if not installed and operated properly.