Will one of these 18W bulbs work in a Coleman lantern that has been using a 13W bulb (hopefully, only draining batteries more quickly)?

Doubt it. The base has plastic tabs that key it for different wattages, your light should have slots aligned to only take 13w (and possibly lower) bulbs. I think that the picture for this product is wrong, my 13w bulbs have the keys at 12 and 6 o'clock , and 18w has keys at 5 and 11.

Can this replace a cooper r10 13w/4p?

If the base is 4 Pin G24q-1, then it will replace without a issue

Is this for G24q-2 base or G24q-1? It says g24q-2 in the description, but the picture looks like a g24q-1.

G24q-2 as all 18watts are manufactured with the plastic piece sticking out on the bottom slightkh moved over from the center.

Is this truly rated for outdoor use? The Amazon listing says it is, but the actual packaging makes no mention of outdoor use. And the website is dead.

I bought for indoor use so I can’t help you

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Circle (4 Pack) PLC-18W 827, 4 Pin G24q-2, 18 Watt Double Tube, Compact Fluorescent Light Bulb, Replaces Sylvania 20683 and Philips 38329-9 - PL-C 18W/827/4P/ALTO

Circle (4 Pack) PLC-18W 827, 4 Pin G24q-2, 18 Watt Double Tube, Compact Fluorescent Light Bulb, Replaces Sylvania 20683 and Philips 38329-9 - PL-C 18W/827/4P/ALTO

Product ID: 370084416

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Details

Brand
Circle
Light type
Fluorescent
Special features
Lightweight
Wattage
18 watts
Bulb shape/size
T4

⏳10,000 hours lifespan

⚡18W energy efficient

💡1200 lumens brightness

Description

💡 Illuminate your space with efficiency and style — don’t get left in the dark!

PRECISION FIT BASE - 4-pin GX24q-2 base ensures seamless replacement and compatibility
TRUE COLOR ACCURACY - 82 CRI for vibrant, natural light that enhances any workspace
ENERGY SMART LIGHTING - Consumes just 18 watts while delivering powerful illumination
LONG LASTING PERFORMANCE - Up to 10,000 hours of reliable, maintenance-free use
BRILLIANT WARM WHITE GLOW - 2700K color temp for cozy, professional ambiance

The Circle PLC-18W 827 is a 4-pin compact fluorescent bulb delivering 1200 lumens of warm white light at 2700K. With an energy-efficient 18-watt consumption and a robust 10,000-hour lifespan, it offers a perfect balance of brightness, longevity, and color accuracy (82 CRI). Designed as a direct replacement for popular models like Sylvania 20683 and Philips 38329-9, it fits GX24q-2 sockets and guarantees professional-grade lighting performance.

Specifications

Manufacturer	Circle
Item model number	PLC
Product Dimensions	12.83 x 3.45 x 12.83 cm; 280 g
ASIN	B01FR8KON2

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