What are the measurements? (if you tell me wrong, you will get a return.)

With that mentality, just don’t buy it.

Would this work as a back light for 35mm slide duplication with a macro lens: i.e., is the light even across the surface or do you see each bulb?

The light is even across the complete light. Use them with a magnet mount. Very useful

What is the lux output for this camera? How far can it be from the subject while still being effective?

I can't directly answer the question - I use it as a fill light for video meetings. At about 3 feet away I use it on or near the lowest setting. Ultimately the answer to your question may depend on the ISO rating of the camera or recording device. Lightmeter at ~10 feet gives an EV of 7-8 on brightest setting at 5600K if that helps.

ASIN	B08B4M294L
Best Sellers Rank	#764,830 in Electronics ( See Top 100 in Electronics ) #1,079 in Continuous Output Lighting
Country of Origin	USA
Item Dimensions LxWxH	7.6 x 2.5 x 8.9 Centimeters
Item Weight	150 g
Item model number	VL81
Manufacturer	VIJIM
Product Dimensions	7.6 x 2.5 x 8.9 cm; 150 g

LED Video Light, VL81 On Camera Light with 3 Cold Shoe Rechargeable 3000mAh Battery Bicolor Dimmable 3200K-5600K CRI95+ Portable Photography Photo Lighting Panel for YouTube DSLR Camcorder Vlog

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